I just bought myself an unused 2001 ZX6 and am interested in getting a new exhaust system. I have done some research and noticed that the Vance & Hines SS2-R is the only one I am finding for my bike. The price is $459 for the full system. Does this mean that I would have to buy 2 sets since my bike has 2 pipes? Or Would I just replace 1 and leave the other side with no pipe? I would appreciate any info. Thanks.