[suicideneil]

The Pro diffs are truggy ratio, and lower your overall gearing quite a bit more than the Buggy ones do- not ideal as it means having to run a larger pinion/ smaller spur to get the correct overall ratio ( buggy diffs only need a pinion 1 tooth larger than if you ran stock emaxx diffs ).

To clean the MMM pcb, I would just use a can of compressed air, and an old fine paint brush to sweep away the dirt and grit. You can get better fans that are the same size (25mm square), but you have to switch the plug over with the stock one so it will plug into the MMM board. Brands elude me right now, but there are a few threads on the subject burried in the CastleCreations sub-forum... somewhere...