I have a dilemma! I am in the process of buying an S4 interior for my car and also have the opportunity to buy the full s4 milltek system with sports cats! but my car at the moment is a totally standard 1.9tdi q sport. So is it really worth me fitting such a good system or would I be better off doing a deal on the suspension and brakes? As the car stands at the moment the exhaust would be more cosmetic or would it add something taking into account that in the future I want to tune the car but even then how far can I go with what I have. In fact is it even possible to fit the system or is there major changes involved?