Anybody want 200+mph at 7000rpm?

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=21654&item=2483832791&rd=1

i cant see how he's worked that one out?! what is the standard diff ratio?! assuing the original top geared speed was 150, that would make the original ratio 4.6 maybe that includes raising the rev limiter...

standard diff ratio for 2wd cosworths including RS500 is 3.64:1