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if you're gonna spend money, spend it on German TUV approved stuff with millions of pounds of research behind it, not some rubbish built by a bunch of blokes in Essex
he's talking out of his arse, if he's put an F4R engine in with a 9:1 comp ratio you'll be massivley down on power
stock is 11:1, an exhaust system makes 0 difference to comp ratio!!! he's talking rubbish!!! DEMAND the same engine number!!!