pacesetter question
The PS LT's are slip on at the collector for the PS y pipe then the other end of the y pipe can be used as either a slip-on or they send you a flanged adapter for a catback system that requires it.
As far as the tune I think you will fine. I had my comp tuned for LT's before I even installed them and the car ran fine.
Your going to have to cut the flange off your catback if that's what your talking about. Depending on what the catback is, you going to need some custom fabricating.
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I would been happy to give mine to you unfortunately it got stolen (scrap metal bandits in A^2, MI... right under my nose too during the install)
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I dont believe you will have a problem with changing the headers from the shorties. Also, I know PCMforless does great work, but I would really reccomend getting a dyno tune after you put your gears in. I recently dynotuned my car and you could see the generic programming that pcmforless did ( car ran ok on it but its just generic tuning, not engine specific), and from the pcmforlesstune to the dyno tune I picked up 37hp and 40lbft tq after the dyno tune.
I have one of those ball & socket flanges brand new if you would be interested in it. its for 3" pipe.



