Both our democar and a few customer cars have been fitted with a HKS Legamax exhaust from the downpipes and back. This includes a muffled midpipe and a catback system. We choose to use the Legamax due to the low noice level. There´s a 95dB noice limit on Swedish tracks so we needed a quiet exhaust. Check out the pics and get in touch with us if you want an exhaust for your GT-R. We sell ALL brands on the market, not just HKS.