Hello! I recently purchased a 2007 zx10r - all stock, no mods, with the exception of the mufflers. It appears that the previous owner somehow "shortened" the stock mufflers. It looks like they did a pretty clean job - must've removed the end caps, cut off about 4-5 inches, then re-installed the caps. The bike runs and sounds fine, but I'm wondering if anyone has ever heard of this being done - doesn't seem like a very common thing? Can this have a negative effect on the engine's life or performance? This is my first sportbike, so I have nothing to compare it to. Thanks!