Rob,
There is some good discussion on a topic in the HRC NSR section. I have a HRC PGM (ULD Fuel I think). I have not run it back to back with the standard PGM so have not seen the real difference. However, Dan Williams has dynoed his NSR with the PGM fitted and found + 1.5 BHP.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30