Plenum spacer won’t help you make power above 7000 rpm, though. Yes, the front cylinders are starved of air, so the spacer will help the engine make more power throughout its current power band… not above it.
Heh heh… “butt dyno”… 
Plenum spacer won’t help you make power above 7000 rpm, though. Yes, the front cylinders are starved of air, so the spacer will help the engine make more power throughout its current power band… not above it.
Heh heh… “butt dyno”…