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Author Subject: De-cat with standard system?
ash j

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Location: Fareham

Registered: 02 Mar 2011

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Post #1
As some of you may have seen, I have offered to swap my Magnex system and de-cat for a standard system and normal cat in the wanted section.

Has anyone fitted a de-cat to a standard system? Might be a bit easier for me if I just source a standard cat back system and use my Magnex de-cat, but I have two questions:

Is there any issues such as the middle box going/blowing much sooner due to having a de-cat in front of it? And would a standard system mate straight up to my Magnex de-cat?

Thanks for any help guys Smile

Ash
Posted 11th Oct 2012 at 03:24
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #2
Moved to Exhausts. Smile

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Posted 11th Oct 2012 at 06:16
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7057sam

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Location: Stowmarket,Suffolk

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Post #3
I ran a magnex on a standard system for about 6 mouths and sounded great and was straight fit, I think I may no help the blowing of the middle section as I derestricts the air flow.I reckon if you drove it hard all the time I.e cosnstantly trying to get it poping you'd eventually do it.

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Posted 11th Oct 2012 at 08:36
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stan_306gti6 Forum Admin

Location: Kent

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Post #4
Decats do have a detrimental effect on centre boxes. Yes

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 11th Oct 2012 at 13:30
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #5
not if its a half decent centre section, what did they do before the days of cats eh ? Wink

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Posted 11th Oct 2012 at 13:44
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stan_306gti6 Forum Admin

Location: Kent

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Post #6
welshpug! wrote:
not if its a half decent centre section, what did they do before the days of cats eh ? Wink


My decat blew the baffles out of my Magnex centre section. Yes

And then when I ran the straight through centre section the baffles got blown out of the backbox. Yes

In pre-CAT days the exhausts were made with better baffles which would withstand higher gas flow. A centre section bought these days for a car which was designed to use a CAT will have weaker baffles than one which was made for a car which was older and didn't have a CAT. Therefore, the use of the decat will effect the silencer over time. Wink

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 11th Oct 2012 at 14:36
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welshpug!

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Location: Bigend, Wales.

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Post #7
I very much doubt that, I have seen what places like longlife etc have on the shelf, and they certainly don't have cat specific silencers LOL

i.e, magnex silencers are s**t LOL

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Posted 11th Oct 2012 at 15:18
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stan_306gti6 Forum Admin

Location: Kent

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Post #8
welshpug! wrote:
i.e, magnex silencers are s**t LOL


Qualify that statement please.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 11th Oct 2012 at 15:38
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #9
stan_306gti6 wrote:
the baffles got blown out of the backbox. Yes


Thumbs up

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 11th Oct 2012 at 16:28
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stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #10
Roll eyes

It may well also have something to do with my car is running over 450bhp, which is rather more than a standard one would put out down the Magnex. Yes

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone Love
Posted 11th Oct 2012 at 19:00
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adam b

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Post #11
stan_306gti6 wrote:
Roll eyes

It may well also have something to do with my car is running over 450bhp, which is rather more than a standard one would put out down the Magnex. Yes


Silly boy. Roll eyes

Its one of those really, you tend to sacrifice a bit of midrange torque for top end losing the cat. Gains you bugger all really imo. Mine certainly didn't feel quicker as a daily driver.

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Posted 11th Oct 2012 at 19:23
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jonnyvandijk

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Registered: 14 Mar 2005

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Post #12
stan_306gti6 wrote:
My decat blew the baffles out of my Magnex centre section.


Same here but with a standard engine. Same as my bro's as well but don't know what exhaust he has.

I would think a decat with a standard exhaust would do the same. Although having no baffles in the centre section is not the end of the world, just a bit louder. I've not got mine fixed and have the cat back in now although not driven it for months.

Welshpug you do make me laugh! LOL

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Posted 12th Oct 2012 at 13:15
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Ed_van_dijk

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Location: Halesworth

Registered: 10 Jan 2007

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Post #13
jonnyvandijk wrote:
stan_306gti6 wrote:
My decat blew the baffles out of my Magnex centre section.


Same here but with a standard engine. Same as my bro's as well but don't know what exhaust he has.

I would think a decat with a standard exhaust would do the same. Although having no baffles in the centre section is not the end of the world, just a bit louder. I've not got mine fixed and have the cat back in now although not driven it for months.

Welshpug you do make me laugh! LOL


Mine is a powerflow centre section with a scorpion back box and yes, the centre section is now hollow thanks to my decat.

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Posted 16th Oct 2012 at 17:00
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aaron6

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Post #14
I didn't like the the lack of torque with a de-cat so put the cat back on my longlife. My car feels better low end and mid range now. Smile

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Posted 16th Oct 2012 at 18:52
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