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It has to be on the screen.
I had mine on the dash board and got pulled by the police as one of the road side tax van things couldn't read my disc. Was told it has to be clearly displayed in the bottom left hand corner, on glass.
1/4 mile isn't just about the engine - Although Has a Williams recorded a 14.1 with off the shelf chip decat and filter like Chris's Cup? No.
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Martins old hybrid with above mods done a 13.9 IIRC