Hi people, I'm a newbi.. I searched for something on this subject but couldn't find anything on it.. when i was changing my pipe to the yoshi i couldn't resist starting it with no exhaust at all.. i thought it sounded GREAT.. but any-who i know most if not all bikes have a problem with this do to backpressure. my friends ZX10 doesn't seem to have a problem with a dump off the mid-pipe. i don't know if i would be able to run mine for a few with an open pipe any info would be appreciated.. i have a 2008 Honda CBR 600RR. Converter is in the mid-pipe..Thanks..