I think you have to put the included "Skunk 2" sticker on to get the full performance benefits. I don't know that my butt dyno is tuned well enough to notice a difference between the two headers.Wow dude that's for the long post! :thumbsup:
Did you find it gained any more performance? Sound any different? I think it's this one that people said it sounds like needles in a metal tube which surprised me because it's welded
I think it does have a little deeper tone to it compared to the OBX. Right now it's kind-of hard to tell because I've got a motor mount that is going out sending a lot of noise and vibration into the cabin. I'll fix that soon. [Edit: it turned out to be the anti-roll bar rubbing on the header. See the edit in the original post.]
The needles sound is probably the thin wall tubing ringing like a tuning fork as the exhaust pulses hit. It's there mostly when you are accelerating or under load.
I'm doing track days this weekend so I can post some before and after videos so you can hear the difference in sound.