I’m pretty sure for an exhaust I’m going to not skimp out and I’m gonna go with a header b-pipe and axleback from T1R as well. They really did their research on pipe diameters and it turns out that most aftermarket exhaust systems are a tad too wide for the fit to work efficiently, making them pretty much a wash performance wise. Based on the Dyno results Ive seen on fitfreak.net the gains from the T1R setup could be pretty impressive depending on how reliable the results are. Regardless even if its a wash performance wise I really like the baller looks of the T1R set-up.
Heres what AJ Racing got for Dyno results comparing the stock fit vs. The same fit with a T1R I/H/E b-pipe and lightweight crank pulley. Also there is a graph for the exhaust minus the header as well.