Seriously guys I went through Moneysupermarket.com, the best quote was with Admiral,it just gives you a drop down menu to select your modification,engine mapping comes up and that is it.On checking the same quote with or without mod the difference is actualy £9pa !!! Needless to say I couldn't believe it either, so I proceeded with the policy and checked with Admiral who were more than happy and helpful.Job done fully comp for £285 with legal cover and Prot NCB.