Quote:
Originally Posted by JBA87
Does anyone know what the performance difference, if any, is between a 3" s. 3.5" inch pipe?
I have ER but it's a 3.0". I'm curious if the extra 0.5" makes a difference on a tuned car
Ja
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You won't get any performance difference under stock or mild tune.
You will need aggressive tune to take advantage of bigger diameter.
But then, you will be stuck with a bottle next in the mid-pipe and muffler.
Proper way is to go big all the way from Turbo to tailpipe.