Difference between 2.5 and 3" exhaust systems

[old-git]

Interesting comparison. Unless you are producing a lot of power, all a bigger system on your 150bhp Clio/Astra/Corsa is doing is weighing you down

 

[HDi fun]

And making lots of nasty noises.

 

[TCJBOLDIE]

That is getting the correct info/answers from"the horses mouth" and not the other end.

 

[TCJBOLDIE]

Wish that there was someone or a workshop that would be able to demonstrate what would happen when swapping from a single to twin scroll turbine housing.

I realize that to do so would require some re tuning of the ECU to adjust the AFR's to prevent leaning out and detonation.

 

[SLEEPER]

absolutely unless its big power on a larger or high revving motor then 2.5 or 3 inch makes little difference . It is simply to get rid of the gases and much more important on a turbo car
Ive upgraded from a 3 inch to a 100mm system but that was only really needed when the motor was increased to a quite high revving 3 litre with a large single turbo . High revs and bigger capacity equals more gas to get rid of