Exhaust restriction/velocity and torque

[drecords]

Last year I ran on a 54mm restrictor on a brand new motor, 297/260.

After a full season, this winter I reduced my 2.25" pipes to 1.875" for about 18", and put in thicker gear lube, ran 304/261 on a 57mm.

I'll take it.

7 ft-lbs of torque is impressive