Jake,
Folks have been doing a similar mod on turbo cars for years. I have a manual boost controller on my daily driver and for $40 now have 13psi max boost instead of only 8. Hasn't helped mileage any, tho... <img src="http://www.catsailor.com/forums/images/graemlins/confused.gif" alt="" />
Same with my pickup. Instead of 21psi, I get 32 psi now.
For those with turbo'd vehicles a boost gauge is an excellent way to tell exactly how much fuel you are pouring into an engine.