My headers (an '09 EFI) are double skinned and don't blue at all and it gets ridden hard. The bike has been running on the TORs tune since birth so that might explain it. The factory tune with stock pipes is lean/hot.

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