if you go with the zzp downpipe you will have a hi flow cat built in if you wish and you can add the rear 02 bung so that you are not throwing any codes. Leave the res.......I agree with basically everything bio said and I can vouch for the v6 sounding bad if the exhaust is modified too much(it was like it when I bought it) so I put on different mufflers, tips, and put in a glasspack where the res was supposed to be. Sounds much better now. For best results post your questions in the General Tech sections, or specific motor areas for the most viewers. Of course if it doesnt apply to those areas, please pick the area that the thread applies to. Good luck. Yes, and I would also recommend that you get a 3" downpipe and not the 2.5 zzp has them both bolt in or weld on fyi.......
