Just a thought, we have yet to see any amazing dyno #'s for downpipes vs. gutted pre-cats. I understand they should make more power but the only person I know who has dynoed with down pipes was running about average HP for the stage he was at. The numbers were the same if not a little lower then what other people have done with gutted pre-cats and the same mods. I'm sure they could help but is it worth it to spend $600+ for B&B which are suppose to be the closest fit or pay $400 for a set that needs allot of bending to make them fit. Personally I'm happy I didnt install mine, it looked like it was going to be a real bitch to get them to fit much less make them so they wouldnt leak. My .02 John