I seem to recall (but my memory is dodgy here) taking the battery mounting off allowed the cable to fit between the frame and the airbox. This is coming in the gap from the side so you don't have to feed any plugs through the tiny gap. Apologies in advance if this is a bum steer.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge