ano gamit mong pipe? ganu mo n katagal tinanggal ung sau,, well yup it change its sounds(tuno) i think its bcoz its more lighter than b4 and rotates faster than b4 and have quick responds in every revolution,, you dont have to worry about it, that cant do any harm to our engine, ive remove mine 1wek b4 a bought my sniper now im running a year havent encountered a problem..
http://www.yamahat135.com/posts/360548/
dont worry bro thats pics has nothing to do with d comprision assy.. ride safe bro, gud luck to ur modes