Hello to all guys ...
Thanks to this forum I was able to put the intake manifold of 306 GTI6 in my S16.

I then mounted:
- Intake Manifold 306 GTI6
- Injectors GTI6
- Complete exhaust gr. N brand "CECAM sport" 54mm without catalyst (original exhaust manifold 306 S16)
- Direct suction
- Original ECU remapped on the dyno

My 306 currently has 163 hp at the wheel and the limiter moved only 400 rounds since up to 6800 the engine that drives it is a pleasure.

Use your car to 90% racetracks and sometimes in big go-kart tracks.
I found myself often having to choose, the output corner, a second gear at 7000 rpm or 4000 rpm in third gear .. the gap is too high ...

I thought the 6-speed gearbox of the 306 GTI6 could be my solution.

what do you think?

to replace the gear I need other components?
I know that I have to change also the lever and rod to get the knob with the syringe to reverse. In addition to this? axle shafts? clutch? other?

we pretend to consider a general discussion ... leaving aside the case that I showed ..

in general, one for use in motor racing circuits, it is better the 5-speed or 6-speed?

you can have a list of the reports and the final of Both transmissions?

I found the difference in gear ratios.

5speed:

1th gear ratio: 2,92:1
2th gear ratio: 1,85:1
3th gear ratio: 1,28:1
4th gear ratio: 0,97:1
5th gear ratio: 0,76:1
Reverse gear ratio: 3,33:1
Gear Ratio (end): 4,43:1
RPM at 120 km/h (theoretical): 3.600 rpm

6speed:

1th gear ratio: 2.92:1
2th gear ratio: 1.87:1
3th gear ratio: 1.41:1
4th gear ratio: 1.15:1
5th gear ratio: 0.95:1
6th gear ratio: 0.79:1
Final drive 3.95:1

ok guys, I found the 6-speed gearbox ....

last question before you buy ....

can be installed? is plu & play? directly change the whole gearbox?