It is 2.5. Fitment was good. It was kinda tough to line up the flanges with the gaskets (needed someone to help me hold things in place while I threw the bolts and gaskets through). But all in all, it wasn't bad. No rubbing or anything like that. I wish the gaskets provided were a little better but I could always upgrade later. With the lift, it made life easier of course and no signs of leaks so far. If I had to guess, this system probably sounds a lot like a fwerks or Cobb system. I'm glad my gamble paid off, I was really worried about the whole thing and I hope it can pave the way for someone who is on a budget and wants a good catless turbo-back system.
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