Ya exhaust wise I would check out MAXXFAB they have a badass side exit exhaust and they make the 3" O2 housing you want...he also is a local guy but he's one of the most popular exhaust O2 housing guys in the US. He's done the Super Street SRT4 project car exhaust and O2 housing for the magazine! I went ATP 3" down pipe with Electronic E cut out and Sebring Tuning Exhaust...but I would go with MAXXFAB if I had to do it over again. Also AGP huge FMIC is $600 and increases power 13HP I have it ITS HOTNESS and works great! Dale only works on select cars in his garage and does anything talk with him tell him Matt told you to call and he will help you out.
http://www.maxxfab.com yet another link!