Re: Need help with a mid pipe!
Last time I checked pretty much all the mid pipes were very close in price. I believe the M4 is stainless, the rest being standard steel.
I still prefer the MJS header route, you end up with a header you can just bolt on that is ceramic coated (the coating is very nice, much nicer than spray painting your header), and it removes the cats in the header tubes. It's something like $70-80 difference if you return your factory header to MJS compared to the mid-pipe. It definitely simplifies the install, no worries about cutting thing's wrong, or exhaust leaks, fitment issues, etc.
07 R6, MJS Header, GYTR slip on, smog block offs, K&N, flashed ECU, PCV, AutoTune, -1/+2.