Have you guys used an RPI X-pipe with the Akra rear slip-on?
Right now I have the Akra slip-on and by itself it's way too quiet. I heard the full EVO system today and it's still not as loud as I expected.
My last e9x m3 had a RPI axle back system but that was many years ago. How would you guys compare the Akra slip-on vs. the RPI axle back?
P.S. If you are familiar, I'm looking for the IS-F w/ JoeZ exhaust note since I know you worked on my friend's IS-F with that setup. What setup do I need to do on my M3 for that sound?
