Hi, how do I find high performance in my 1985 Audi 4000S Quattro?? And I want to buy a Kamel Air Valevce kit that fits for 88'-91' Audi 80/90. Its 2 bumper skins front and back but it only fit european bumpers not US audis?. Make question is can this be modified on the my car or can I fit 88' european Audi 80/90 bumpers on a 1985 Audi 4000S quattro U.S. car. Thank You