I have Pacesetter headers and a downpipe that were given to me when I bought my car last week ('03 GTP). I want to do my exhaust first before my 3.4 Pulley Setup, looking to do the exhaust and order the 3.4 Pulley Setup this week. My question is, to use the Pacesetter headers and downpipe will I need a o2 extention, and if so where do I get this? And since I have the downpipe what else to I need for a good setup? Sound doesn't bother me but obviously not ridiculously loud. I want a setup best for performance. Would I be best off going straight back from the catted downpipe with just mufflers? Or resonators too? If anyone could give me pointers on what to buy in order to have a less restrictive, performance setup that would be great.
