It must just be me then, i only bought the car on saturday and fitted it on monday so that might explain why i didnt notice much of a difference. I ordered something off thier website on monday so il let u know when that comes and you haver an idea then. Haha females also love big....................... wheels. To be honest its not a loud boosting car, the 1.8t in my audi s3 is much much louder and that has a loud dump when you let off.