JIC Y pipe or Stillen headers?

Originally Posted by UFreefer

I got 0 gains from my Y-pipe but the sound change made it worth it. I did a same day dyno comparision with a baseline, OEM exhaust with HFCs, then HFC's and Tanabe Ypipe.

HFC's gave 11hp/tq across the band
Y-pipe had almost the exact same curve. No losses but very minimal gains

If I was to do it again, I'd still only do HFC's and a Y-pipe but would have done a cheaper y-pipe...like a Megan or JIC 350z pipe.

The 370z Y-pipes are the exact same 06+ 350's

Originally Posted by Vince's Red-Z

Hey,
Does the HFC fit on the OEM exhaust? And did you test the HFC on the OEM only? I'm not sure if that was the situation when you mentioned a gain of 11hp/tq. Thanks