It's too bad there was no Apex'i in there. It has the same muffler design as the HKS with larger (60mm) 2.4ish inch piping. That probably would have dominated all by .3whp like i guessed.

I feel bad that Ron did all these tests to show 2whp difference. People will gloat about that but say they dont want the 4whp from an UDP?

Strange stuff this [FJ] sometimes