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I cant help you with the sunroof problem because my 1991 GT does not have one (I have been told that this is rare for a GT).

As far as the exhaust goes, get the 2.5 inch exhaust. You dont have to worry about back pressure on a turbo. That only goes for a natural aspirated engine where if you have too little back presure you could have a problem with the engine.

A turbo is a completely different beast. The first mods to do a turbo is free up the intake and the exhaust. The freer the exhaust the faster the spool up time and that spells more power.

I have a HKS cat back. I love it. However they are expensive. Hopefully some other members can tell you about some inexpense cat backs that are worth it.

Good Luck.
 
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