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I think that "who's map is best" is like every other question which asks which is 'best' - It's somewhat subjective in that what's "best" for one person isn't necessarily "best" for another.
For example, I think that R-Tech's mapping of James's GTI is awesome but, although I haven't driven it (and a passenger ride wouldn't tell me), looking at the plotted curves I think I prefer the curves and balance of my Revo 2 with less maximum bhp. I am of course thinking in terms of practical road use.
Just to add a bit more to that Robin, Nick can set up your car to be an exact replica of a Revo curve (if thats what you were after) as it is a true custom map. You could draw a curve on a piece of paper, hand it to nick and he will reproduce that in your map (within the limits of your car's hardware though)
Or you could take it for a drive and advise Nick of where you want a bit more oomph or a less agressive spool etc and he will make the changes accordingly.
Theres an infinite range of adjustability throughout the rev range with mapping a car, ranging from all out power (like James) or just a 10bhp increase across the range if you really wanted, your not tied down to following a particular curve.
I'll shut up now as i'm starting to sound like R-Tech's chief salesman