Stock I-Pipe Question
1/4" isnt going to make that big of a diffrence..
but thats what most of the Cat backs are..
I have a corsa cat back...3"
and when I added the LT, and Y-pipe with cats, it made it easier to connect cause the catback was already 3"
I don't know Tho, I had a set of IMCO single chamber mufflers on my truck, look like flowmaster, but flow better.. now that thing was loud..
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