has your idle sorted itself mate? whats you mpg like now? i have 165 and have been in a few 185 cars now and i didnt realy notice much different low down either, just keep saying to myself dont do it your cars fine, im abit worried something might go wrong later on down the line or i wont like it and will want to go back! but on the other hand 185 bhp and a v.fast 0-100 time! and the pops and bangs! might have to be done!