erm..... right.....Colin not really no, I have a SP unit that has been rebuilt by K-tech and I would say it performs no better than the Maxton unit on my CBR but I havent really spent as much time on track with the SP unit.

personally the reason I would rather have the Maxton Unit is I am a poser and I like the purple spring.

and Mick yes they are exactly the same.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold