Kakimoto used to make a full twin system but they're discontinued. I think Veilside made a twin system also but again I doubt they're still in production. May I ask why you want to use a twin system? You can use a single exhaust that will work just as good for 1/3 the price and of a twin system also save on weight. I'f you're really set on the twin system about the best option you have is to get a custom one made up by a local exhaust or garage.