I spoke to my local dealer this week re:spitting/popping on overrun, & he wanted to know what petrol i was using (super/ unleaded, 4* lrp etc) and they said that you can adjust the ecu to suit different grades. do any of you guys know if this is a diy job (the dealer claims you have to be a rocket scientist(?) to even attempt it. true or b.s? TIA Darren I