Manual
boost controller

Perform the bleeder
T modification first, then connect a 12′, 1/4" diameter hose to the open end of
the bleeder T. Run this hose to the cockpit. Connect a brass valve (available at hardware
stores in the plumbing section) to this hose. Adjust the valve until the desired level of
boost is obtained (close the valve for stock boost levels, open all the way for max
boost). Make sure that the valve has a large enough orifice to not restrict airflow. You
can test for boost loss by opening the valve all the way and note the boost level, then
disconnect the valve from the hose (in the cockpit) and see how much boost you make. They
should be identical.

Note that when partially open, you can hear the
air hissing out. If this is bothersome, run another hose off the end of this valve and
route somewhere away from you.

Thanks to Jason Knippel for coming up with this idea!