Was a bit bored last night so i started looking at the diy remapping equipment on ebay. How hard would it be to do yourself? Probably very, but for the price of say £300-£400 for a good ish one it could be worth a try. My local dyno place quoted me £399 just for a superchip and £60 for 30 min rolling road. If you could do it, you could always just pay for a rolling road for before and after and charge say £100 to your mates, or all just chip in and do it as a group.