The only problem I had was when I was transitioning to getting my knee down on the right side, my heel would touch the end of the cone.
More than likely it was due to my style, but it was still something I observed, your experience may vary.
I've got rearset risers on mine and I can't put my right foot in the correct position when making left turns with the M4 exhaust. The heel of the boot is blocked by the exhaust so I can't lock my foot in.
I have stock rearsets and have no issues with the M4 GP @ the track. I've leaned over and hit my toe sliders before the pipe. During transitions and such I've bumped the tip of the cone here and there but not enough to worry about.
btw, its your bike so choose the exhaust you like and disregard negative comments.
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