My 3 inch exhaust when the free flowing muffler is in is quiter than it was stock, without the muffler is a bit louder.
Matty there is a big difference in area between the two:
3 inch = 17.9cm3
2.5 inch =12.4cm3
A touch more than 40% more volume in the 3 inch.
I really don't think a 2.5L engine needs a 3 inch exhaust though. I would just get 2.5 if I had my time over.
matt, dont know how you done those calculations but put that way i guess there is quite a in difference
I just worked out the area for each of the pipes to compare them. I'd love to say I remembered how to do it from school, but I had to google it I have had far too many beers between then and now.
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