I'd definatly go with the resonators if your planing on running test pipes. I'm personaly going to go with J-spec DP's (just because I already have them), Cat pipes and X pipe with no resonators, just because I like the way it sounds. Not the best performance but that what the electonic cut outs are for
There are a few sound clips on TT.net if you want to hear it but you loose most of the low end noise in the recording. It's not the most accurrate sound but it will give you an idea.