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They fit great, good ground clearance with the y pipe and before anyone mentions it. Yes, the Y-Pipe BBK offers is 2.5" then merges to 3". I really doubt it'll make much of a difference if it was all 3". Unless your concerned with HP numbers.
First get under you car and check out how your current exhaust is put together. Mine is welded from the stock manifold flange all the way back. Everything from the I-pipe to my LM1 resonators. This means I'd have to look at removing the entire system out to the tips (luckily I am doing true duals so it was going anyways). This will add to your build if you have to replace your current I pipe backwards as well as just the headers and new Y.
As others have said, 1 3/4" is good for bolt-ons. When you get around 450hp it may do well to step up to 1 7/8" (or start there if you plan on putting a lot of money into your build), and over 500hp move on to 2".
Then remember to factor in o2 sensor extensions. Mine for some reason already had one on the driver side.
You may as well needs to replace your gasket. Some have luck re-using, others not so much.
Depending on who you buy from, you may as wellhave to factor in clamps into your build as well.









