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HillPower is cheaper!
Not sure about the 172/cup, but I paid £150 fitted for my chip on the valver, whereas I think my brothers was around £470.
The unichip is better, its just most people dont want to spend that much.
Dont think you can rev it to 8K RPM with just a chip.
Id have thought youd need some wilder cams too, shouldnt do any damage as long as its fueling right at those kind of revs.