I recently posted a thread in this forum "MIVV Complete Exhaust System" and wanted to bring up one last blurb. The system I installed is a cat delete type with the option of removing the flapper valve - which I did. I removed the flapper pipe, cables, and servo motor - and cap & stowed the electrical plug running to the servo. Like I mentioned in the other thread, the bike runs really nice - and I still need to add a few more goodies like a K&N and a Booster Plug. The only negative I experienced was that as soon as I unplugged the servo connector, I got an engine warning light up on the dash - Doh! I rode around with it for a while noting that other than annoying me - the performance of the bike wasn't affected. Well I finally got tired of seeing that "orange triangle of death" up on the dash and put the servo motor - sans cables, back on the bike and re-connected the wiring lead. Happy to announce that the light went off, the bike runs great, and I didn't take the bike to a dealer and made to look like a fool. Lesson learned - remove the flapper, leave the servo on the bike without the cables. Now to get rid of that GPS bracket!