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