+1 on the R1 MOSFET from Roadstercycles. It's not just the superior RR, its the heavier gauge wiring, the waterproof heavy duty connectors and the direct battery loom which also make a huge improvement. The hot shot seems to be lacking in all of those areas and cost much more.

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