Went w/ the MAC longtubes..I hope I made the right choice
 

Well I went with the MAC's due to the price (300.00) and I've "heard" that they are pretty good. Any comments on whether or not I made the right decision?

My choices were BBK's that probably won't fit w/out mods on a C4 - 430.00

Kooks that will fit - 800.00

Hookers that will fit also - 600.00

Should I reduce the collectors to 2 1/2 so I can retain my exhaust? Any expectations as to what performance gains I could get from this?

so I take it you have the 3" collector, I believe you can get the 3" collector prochamber to match the headers and still have a 2 1/2" cat back system. Only problems I hear from MAC is their coatings don't last too long if it is the HTS, and when removing the headers, from the car to re-use again. make sure they are cold.