Track Day Winner
Join Date: Sep 2013
Location: Canada Ontario
Motorcycle: 2011 GSXR 750 Current, 2007 gsxr 750 -sold-
Re: Slip on Exhaust upgrade: M4 or Yoshi R77
With just a slip on you will not need a power commander.
I had a M4 Slip on, and it sounded great. Until I cut the cat off and did the MJS mid pipe.
Got big gains cutting the cat off, But the M4 got allot louder and didn't much care for the sound afterwards. This is just my opinion, Others may like it.
I ended up getting a full R77D exhaust in the end. And that will be the exhaust that remains on my bike.
Its not all that loud until you really get on it.
I really love the sound and performance. It looks really good too, But liked the sleek M4 look better.