I have the belly pan to help protect my coolant bottle. My 05 has a lowering kit on it and I drag bottom on speed bumps and the kit takes the scratches instead of the frame. The only negative thing I can think of is and I'm not exactly sure, but my rear tire seems to get hotter and pressure goes up. I think this happens because the belly pan doesn't allow the bottom of the engine to get rid on its heat in a wider atmosphere environment but flows it towards the tire. I wish a air tunnel experiment could be performed to verify my thinking. I have a TPMS on the bike and will start off with rear tire pressure 1 or 2 pounds below the specified 41 lbs. But shortly it will reach the specification and sometimes climb as high as 48 lbs. I know tire manufacturers take this into consideration when they make the specifications. But how high is too high?