I just bought an apexi dunk muffler for 94 supra na. I figured as long as I am having that installed, I am considering running bigger piping. What is the best size pipe to run so I want lose any bottom end power, like I would running TT size pipe? I am thinking that I might be best off running the same size pipe as the Greddy MX for the NA. How many inches is that anyway? Any comments on any question would be appreciated.