the main reason I went back to stock was to satisfy the noise regs, although the FMF powercore 4 sounded sweet :deviousThat makes alotta sense. Kinda like the bad rep the TLS got as being the "Widow Maker" without a steering damper. Sometimes its just the little things.
A buddy of mine whom had one told me that the stock exhaust made the best power and every aftermarket system actually killed some power. This may not be true now but for the first few years this seemed to be so at least according to him. He tried two different set ups but went back to OEM and said it worked the best. He said most went back to stock after experiencing the same thing.