If they worked every race car, drag car would have them on. It is hype, all hype! You will lose HP because of the turbulent flow! They laugh all the way to the bank! Get it dino before and after. Ask a good speed shop! Or dino shop! Big thing is you will have to reprogram the computer for extra air flow to get thje most out of it even if it did work. How many lingenfelters and cosworths have these on? NONE! I know the my spelling.