SW .21 Its a great mill! The .28 Works well, but SH hit a homer with the SW .21 It rocks and runs well, My Bro runs these in the AZ state series and is very competitive with them! I would definatly reccomend them for a club racer buget or not, they have ponies, this is a great engine, SH makes some really good mills, and they aint an arm n leg!
