Recently bought a C43 very nice and fast.....sorry was for a bit till a f355 puled away from about 150 onwards. I'm in the UK and I can not seem to get it ober 155-160mph. I know its limited but will getting superchip sort this out and give me more power. I don't really want to spend thousands on increasing bhp any more effective ways than adding a supercharger. And does the c55 run on the same lump as the c43 tried to get one in wright hand drive apparently their is on 7 around.