Muncie m20 vs M21
M20 has weak internals and case but ok for street and chirping street tires, the M21 is a better choice for muscle on the street and a little weekend drag racing but the case is week Ive sheared the case ears off and twisted off tail shafts when running wrinkle wall slicks, the M22 (the rock crusher as we racers called them) are designed to take abuse from high HP and high …