This is a before and after of a 2007 SV650 that is raced in CCS and WERA. The red line is an all stock engine and airbox with a full Leo Vince exhaust, PC3, and VP U4.2. The blue line is after WERA Superstock modifications to the engine. The heads are milled, the cylinders decked, a competition valve job performed, and the cams timed to "numbers that work." A pretty nice gain.