have you got a k&n on your car, Got told today by a tuner round my way that he was asked to put on a load of chrome gibbings on some chaps rs so he did, When the bloke got his car and went off he said it felt like it wasnt running as quick there was something missing and it turned out this heat shield he put over the turbo to keep the temps down ended up sending the heat acrosswards towards the k&n creating more a warmer induction and knocked on the rollers 10- 15 bhp off the power