Professional Answer to Exhaust Size Question 2.5" vs 3"

I'm so happy I read what was said here as there is much information for my future builds. On my end I personally have 2 1/2 inch pipes from the fenderwell headers straight back under the rear going to 5 inch supertrapps which are adjustable for sound as well as low, mid and top end. I've run these on this car on 3 motors so far, without a clearance problem or any problem for that matter that I have noticed and the car is lowered. For my next build which I won't discuss here because its not a mopar, chevy or a ford and have considered going with headers like the old Lola and GT40's exhaust which are sometimes called the bundle of snakes, sorta hard to explain but you can search for it on Google. I believe they are great for low rpm motors like strokers but will cost you big dollars if you haven't welding experience.

The info given here is so intense and truthful that I have been very impressed with the FABO members who replied to the poster and where I too have learned something.