I take my car to Interpro who have always treated me very well. Nothing against the new TSR Performance but it is ment to be a whole new company as the old set up got a very bad reputation then went bust over night costing a lot of people money. TSR have just had a new dyno fitted but how well they are trained on it and weather they are having teething problems a don`t know. Interpro have been going for years and know their dyno`s 2WD and 4WD inside out.