Well I just bought a used borla catback. It's for an LS1 but should fit my 97 LT1 I believe. I have one issue with it. I think the passenger side exhaust tip is missing a 3 hole flange to bolt to the main part. Is that part something I can just buy somewhere? Or do I have to go to an exhaust shop and have it made?

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Just take the middle pipe to the exhaust shop and have them weld a 3 hole flange on it. Take the entire exhaust though this way it can be clocked correctly.

 

so the pass side on this catback does not pass through the muffler? Gonna be loud. may want to bolt a cutout to that three bolt flange or something.

edit: so it looks like it should have come with several plates that bolt to that flange with different size holes, to allow tuning of the loudness.