For this stage 3 we increase the engine capacity by boring out the existing cylinders and installing high quality American made forged pistons. Using our own ‘in house’ designed and manufactured machining fixtures, we precisely bore and hone your cylinders. The M8 107 becomes a 117, and the M8 114 becomes a 120. Coupled with the appropriate exhaust, air cleaner, and camshaft upgrade, this is a huge ‘bang for the buck’.