Originally Posted by Zeph
ya I was talking about AR... 3" pipes with 2.5 inch flange openings is WAY too abrupt IMHO. Not saying they don't "work" but that is not ideal for air flow smoothness. RR seems like a pretty good design, but I still don't see why they don't just stay 2.5" the whole way. The entire rest of the system is 2.5"
wider opening = more flow = more power maybe?
seems we are on the same side..