Yeah i also recommend the Apexi one i have had it twice (2 cars) and will buy it again for this one. Most features are wank (Battery voltage & A/F Ratio) but the design is sleek and small (Pen size) so you can put it out of the way and the all important handbrake cut off so it switches off when the handbrake is put down.

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MY02 WRX STi - sold :(
'12 Golf GTI