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You will need a tune. Your signature doesn't say if you have one.
No tune necessary except to turn off the rear O2 sensors.
OP: Go to any of the many sponsor websites and look on there. There are plenty of choices and they pretty much all work fine. I prefer the Prochamber over the H myself. Go to YouTube and listen to clips, see what you like, though the sound is more in the different mufflers rather than the different midpipes, aside from the difference between catted vs O/R and H vs X vs Prochamber, different brands mostly sound similar.
No tune necessary unless you want to turn off the rear O2 sensors.
OP: Go to any of the many sponsor websites and look on there. There are plenty of choices and they all work fine. I prefer the Prochamber over the H myself.
Oh really? And what about the COT feature that must be dealt with on the 2011+ cars? It MUST be addressed.