when i swapped my 20 for a 22r i rebuilt it with webber32/36 heddman headrer had the head decked 30thou,cam,oversize valves . its like night and day it use to be 64mph tops now its 85 and i have to keep the rpms down till the engine is broken in good . i cant wait to tach it out . so yes more air/gas in plus freer flowing exhuast = power
