I'm currently running JBA headers stock pipes and a reverse flow turbo muffler (Dyno max clone). I pulled the fuse for the ECM after installation and after a hundred miles or so of driving am very impressed with the difference. So impressed I'm in the middle of installing LSD to help with the spinning tires. The exhaust is a nice low berble. I had a bad seal where the stearing shaft went through the fire wall. I was surprised at the woosh sound the new headers produced. So much so I checked a couple of times thinking it was an exhaust leak. I fixed the seal and the THHHHHHHHHH sound is all but gone.