i have just started a new job and opposite where i work is a trade sales company and they have a grey r32 gtr for sale. it looks to be in good condition apart from some cheap and nasty universal seats and a cracked ugly aftermarket front bumper. it has brand new ultralite rims and tyres and i spotted a nice titanium exhaust on it too. now it is claimed to have 550bhp but i havnt got a clue what has been done to the engine to achieve this. now comes the bad news, apparently its bottom end is knocking. it has 65000 miles on the clock and is marked up at £4000. i can have it for £3200. considering it needs an engine rebuild, would this be a good buy? honest opinions please.