Seen this on ebay what do you guys think?
http://www.ebay.com/itm/GP-Exhaust-Kawasaki-ZZR-1400-ZX14-Ninja-06-07-2006-2007-ZZR1400-EX152-/160686432262?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item2569a86006#ht_5176wt_1185
I youtube it and the sound pretty good for slip ons. But not sure about the dual thing..