Full review: http://www.autoexpress.co.uk/videos/featuresvideos/265933/superchips_renaultsport_mgane_video.html#ixzz1HbYQTomh Extra performance doesn't come cheap -- well not usually anyway. But for £445, Renaultsport Megane 250 owners can get their cars' computer reprogrammed by Superchips to boost power from 247bhp to around 300bhp. So what is the effect on performance? To find out we raced a Su
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