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Author Subject: Best exhaust setup
gb_gti6

Regular

Location: spalding

Registered: 04 Feb 2010

Posts: 425

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Post #1
I have read previous threads, but just wondered if people had any other ideas to what they think the best setup is for a Gti6

I currently run with a sports cat, and stainless centre section and backbox.
I want to get the best performance I can and wondered what people views were on the what to go with!!

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Posted 18th Nov 2011 at 18:01
anth

Seasoned Pro

Location: Colchester

Registered: 04 Apr 2006

Posts: 3,651

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Post #2
What you have will be fine.

Don't get caught up on it too much they all do the same but make a different noise.
Posted 18th Nov 2011 at 18:47
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

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Post #3
Apparently, the best exhaust setup by far is a thinwall copper pipe, surrounded by a small bore copper water pipe used to heat water to power a small steam turbine which then drives a supercharger compressor. Obviously this is a very common choice on here and you will find many questions and answers within the pages of this hallowed forum. If you don't particularly feel in a mad inventor frame of mind, Magnex, Scorpion or Jetex all seem to do a good job of quickly and efficiently removing spent exhaust gases from the engine, useless for boiling water though, they missed a trick there...

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Posted 21st Nov 2011 at 17:08
prism7guy

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Post #4
daveyboy wrote:
Apparently, the best exhaust setup by far is a thinwall copper pipe, surrounded by a small bore copper water pipe used to heat water to power a small steam turbine which then drives a supercharger compressor. Obviously this is a very common choice on here and you will find many questions and answers within the pages of this hallowed forum. If you don't particularly feel in a mad inventor frame of mind, Magnex, Scorpion or Jetex all seem to do a good job of quickly and efficiently removing spent exhaust gases from the engine, useless for boiling water though, they missed a trick there...


Laugh my ass off

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Posted 21st Nov 2011 at 17:57
phillipm

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Post #5
Huh? Laugh my ass off

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Posted 21st Nov 2011 at 18:04
mabgti

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Post #6
Magnex = Quality but boomy
Jetex = new kid on the block lest testing done on systems derived
Scorpion = best sounding and best fit, but poor quality mid boxes causing splitting

My personal choice is questionable, but you cant beat a 2.5" mandrel cut and weld custom job.

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Posted 23rd Nov 2011 at 00:27
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #7
2.25" will suffice for most Wink

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Posted 23rd Nov 2011 at 00:45
Jopeti

Newbie

Location: Tampere

Registered: 03 Mar 2013

Posts: 12

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Post #8
Hi folks!

I have a couple of questions considering exhausts for XU10J4RS engine.
Short info first: We are competing in Finnish Endurance Saloon - class with Xsara VTS.
Rules allow modifications for exhaust system (ex. manifold - which luckily isn't the worst possible).
Our ECU is also modified. Our current exhaust system is self welded 2,5'' system with one silencer.

I've tried to search for instructions of 306 Grp. N. exhaust (diameters, reductions etc.) as I think current systems diamter is too big.
Some exhaust companies sell "grp N" exhausts with 2,5'' bore, but I've also found this one:
http://www.oreca-store.com/ligne-gr-n-acier-oreca-661014-completo.html which is with 2,10'' bore.

Has there ever been some how to built Grp. N. exhaust guide or such available? Which bore size would suit this kind of car best? (180bhp/210Nm).
Our car kicks from 4500rpm, so no need for power below that. Thanks in advance.

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Posted 14th Jul 2013 at 13:51
eliotrw

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Post #9
Answer to your question is a custom one.
Often no more expensive that the off the shelf ones if you but find a good place and they are better made.

I am of the opinion that possibly all of the aftermarket exhausts, Perhaps with the exception of blueflame have a weakness some where or the other.

In my case I want a supercharger, So my exhaust of choosing needed to be about 2.5" all the way through.
Magnex imo are too loud but have the best pipe

Jetex have a s**tty black paint on the back box that burns off, Have a massive pipe and a restriction in the piper where it goes back down for 2.25". But is the quietest.

Scorpion, As with magnex are too loud imo.

Miles's ones are quite expensive and supposedly drone a lot, Not too dis similar to mine I expect but I had my custom one altered after having it so its a lot better now, and is 'suspect' quieter than a miles/torque techniques one

If I had to by a off the shelf I would go for blueflame, I like the tailpipe its apparently not too loud at all, but the only reason I didn't is after fitting and hassle, My custom one was cheaper.

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Posted 14th Jul 2013 at 14:03
JWP EFi

Turbo Legend!

Location: edinburgh

Registered: 07 Mar 2010

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Post #10
ive tried a fair few systems, all with decat pipes, my latest is a 2'' powerflow, nice and quiet and allows for good torque but engine feels choked at high rpm
Scorpion was the best all rounder but the fit wasn't all that good, tailpipe has to sit at an odd angle.
Best systems imo are magnex and blueflame. Magnex is very very boomy but you definately notice the difference in power at high rpm, also a superior fit.
Blueflame shares mag's same 2.5'' pipework but is soo quiet, shame that tailpipe doesnt look right.
as far as off the shelf exhausts go - if you want power and don't mind noise then go for magnex, for a quiet life get a Blueflame or look into a custom made system
Posted 14th Jul 2013 at 23:24
daver6

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Location: Durham

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Post #11
I have a Longlife 2" system and the torque feels more peaky and is very smooth, I do think it runs out of a steam a little at the top end.

I can't comment on the sound really as my cat died not long after the system was fitted, so at present, I'm running an empty cat so it's VERY loud and resonant

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Posted 15th Jul 2013 at 12:51
jimmyhackers

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Location: birmingham

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Post #12
whatever exhasut you fit.....will give minimal power gains. if any at all

usually any "performance mod" will actually loose you power untill you get a remap. and even after the remap with an induction kit and decat your looking in the relams of 1% to 2% power increase.

the quieter the better in my book, less police attention. I had a custom straight thorough decat ss pipe and it was stupidly loud and probably lost me power. it also ruined/overpowered the sporty induction noise

if your looking for more power. go for power to weight, spare tyre, rear seats, pasenger seat, plastic windows, lighter battery, remove rear wiper. carbon fibre bonnet. lighter wheels. 100 kilos removed will be far more noticable than 2bhp added

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Posted 15th Jul 2013 at 12:51
phillipm

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Post #13
Plus, gives you 100kg to play with for your steam boiler and 600ft of copper pipe.

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Posted 15th Jul 2013 at 12:57
jimmyhackers

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Post #14
a good service will probably give you more horsepower than an exhaust will.

oil filter, air filter, fuel filter, gearbox oil, iridium spark plugs, injector clean (cant stress this last one enough for regainging ponies)

and the most expensive thing (o2 sensor) replace or clean this. and youll of gained way more bhp than any silly bean can exhaust could of

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Posted 15th Jul 2013 at 12:58
jimmyhackers

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Post #15
my steam boiler also makes a cracking cup of tea now

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Posted 15th Jul 2013 at 12:59
eliotrw

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Post #16
jimmyhackers wrote:
whatever exhasut you fit.....will give minimal power gains. if any at all

usually any "performance mod" will actually loose you power untill you get a remap. and even after the remap with an induction kit and decat your looking in the relams of 1% to 2% power increase.

the quieter the better in my book, less police attention. I had a custom straight thorough decat ss pipe and it was stupidly loud and probably lost me power. it also ruined/overpowered the sporty induction noise

if your looking for more power. go for power to weight, spare tyre, rear seats, pasenger seat, plastic windows, lighter battery, remove rear wiper. carbon fibre bonnet. lighter wheels. 100 kilos removed will be far more noticable than 2bhp added


Are you mental?
You just compared about 10 hours of effort and at least £900-1200 in parts to a brand new exhaust and 1 hour of bother to the tune of £350-450 pound.

What if you NEED a new exhaust

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Posted 15th Jul 2013 at 15:06
Jopeti

Newbie

Location: Tampere

Registered: 03 Mar 2013

Posts: 12

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Post #17
Sorry mates, I managed to be very unclear with my starting message. Our Xsara is completely built track racing car, so weight reducing or such isn't problem anymore. Our current exhaust system is made according to general instructions for 2,0 16V racing engine - but there's no way it could be as good as Peugeot Sports / Citroen Racing's exhaust system for this engine.

In Finnish forums people told that there might have been specific instructions about Grp. N or Grp. A exhaust systems. I am after these materials, as I would be able to modify / rebuild our current system to be even better. Feel free to visit our facebook: https://www.facebook.com/VTSracingteam

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Posted 15th Jul 2013 at 20:22
vts_tibi

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Location: Nuneaton

Registered: 27 Apr 2007

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Post #18
Joonas, the 306 Gr. N. catalog says nothing about the exhaust diameter, it only gives a part code!

http://www.peugeotsport-store.com/cms/web/upload/documentation/84/4fccb42e7daa3.pdf

To be honest it would ahve been a dumb thing to tel everyone the dimensions of the exhaust if Peugeot Sport alrady had these on the shelf!

And I think you will not notice the power difference from the exhaust alone!

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Posted 15th Jul 2013 at 20:27
Jopeti

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Registered: 03 Mar 2013

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Post #19
vts_tibi wrote:
Joonas, the 306 Gr. N. catalog says nothing about the exhaust diameter, it only gives a part code!

http://www.peugeotsport-store.com/cms/web/upload/documentation/84/4fccb42e7daa3.pdf

To be honest it would ahve been a dumb thing to tel everyone the dimensions of the exhaust if Peugeot Sport alrady had these on the shelf!

And I think you will not notice the power difference from the exhaust alone!


I also had doubts about existence of that kind of data, but it was worth asking. Of course it would end up in best results, if we'd be able to do testing on RR, and modify exhaust bit by bit to find the perfect solution. The Orecas Grp. N exhaust system in my previous post has diameter of 55mm, which is significantly less than our current 2,5'' pipe. Grp. N 306 made about 190bhp, so that bore size could not be so restrictive. I'm guessing we are lacking mid range power with our current exhaust.. Sad

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Posted 15th Jul 2013 at 20:36
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

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Post #20
a Peugeot sport UK exhaust was just a magnex/scorpion with a sensible size tailpipe and some skid plates.

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Posted 15th Jul 2013 at 20:46
mellowr1

Senior User

Location: Maidstone

Registered: 12 Jun 2012

Posts: 995

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Post #21
and just to add...............if you are considering a scorpion,i was going to get a scorpion backbox but they no longer make them,even if they are still listed on their site,as they were a month ago when i rung to order one to be told we dont make anymoreUnsure
Thumbs up
Posted 15th Jul 2013 at 22:50
jimmyhackers

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Registered: 14 Jun 2011

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Post #22
eliotrw wrote:


Are you mental?
You just compared about 10 hours of effort and at least £900-1200 in parts to a brand new exhaust and 1 hour of bother to the tune of £350-450 pound.


yes i am, and if your paying 350-450 for a peice of pipe and it takes you 10 hour to remove some seats and other crap then id say you are too. Smile

my full decat cost 150. and i could strip out a 306 in.....an hour max.

the only expensive parts i described were the carbon fibre bonnet and plastic windows, which yes are a bit silly. i did go on in a later post saying a good service will get you more power than a new exhaust.

but in all honesty.......you will see a better bhp per tonne gain per pound spent on making your car lighter than you will on a fancy exhaust for an NA engine.

i was responding to the original poster hecen some confusion. but to the vts team racing.....if its just a race car then a full decat right? you dont need to pass emmissions or noise tests do you? have it loud and scary and pumping out nauseating fumes to intimidate/debilitate/asphyxiate the other drivers.

jim

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Posted 16th Jul 2013 at 01:47
eliotrw

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Location: Southwark

Registered: 18 Jul 2010

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Post #23
jimmyhackers wrote:
eliotrw wrote:


Are you mental?
You just compared about 10 hours of effort and at least £900-1200 in parts to a brand new exhaust and 1 hour of bother to the tune of £350-450 pound.


yes i am, and if your paying 350-450 for a peice of pipe and it takes you 10 hour to remove some seats and other crap then id say you are too. Smile

my full decat cost 150. and i could strip out a 306 in.....an hour max.

the only expensive parts i described were the carbon fibre bonnet and plastic windows, which yes are a bit silly. i did go on in a later post saying a good service will get you more power than a new exhaust.

but in all honesty.......you will see a better bhp per tonne gain per pound spent on making your car lighter than you will on a fancy exhaust for an NA engine.

i was responding to the original poster hecen some confusion. but to the vts team racing.....if its just a race car then a full decat right? you dont need to pass emmissions or noise tests do you? have it loud and scary and pumping out nauseating fumes to intimidate/debilitate/asphyxiate the other drivers.

jim


plastic windows, lighter battery, remove rear wiper. carbon fibre bonnet. lighter wheels

All of the above are the things you mentioned that cost.
New lighter wheels are going to be 400 used or 600 new

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Posted 16th Jul 2013 at 11:09
phillipm

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Location: Rotherham

Registered: 15 Oct 2006

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Post #24
~190bhp, 2.25 would be ideal.

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Posted 16th Jul 2013 at 11:45
beez_neez_gt

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Post #25
I like the mongoose back box's myself.

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Posted 16th Jul 2013 at 12:24

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