I would replace both of them, i know its allot of money? but it will help you down the road trust me I had to replace both. if you only replace one it is going to eat up the other one. From what I understand this is a common thing with the 10's might not happen to everyone but it happens to allot of us.
Why blend in, when you can stick out...
01 Yamaha R6
03 Suzuki GSX-R 750
07 Kawasaki ZX-10r
07 Candy blue ZX-10R
, Zero Gravity double bubble wind screen, K&N Air filter, 2 bros full system exhaust, PCIII with Custom map, starrotors 8000K HID kit, ASV C5 Gold
shorty levers, Ohlins Damper, Puig rear tire hugger, Solo seat cowl, black painted foot pegs...