Definately go for a Supersprint, I can't rate them highly enough. You can chose to have by pass pipes too instead of boxes. So can go louder if you like? I've had a few systems on my VR and My Mk2's. Including Remus, Sebring, Magnex, Scorpion and Jetex. After all that expense and trial and error I've found Supersprint to be the only one to go for. Build quality is first class too! Nice and subtle noise, that doesn't drown out the sound of the Ram Air and the Shrick hiss! Nice little burble when it gets warm too! Its quiet and subtle unless your really giving it some which is just how i like i