I have been doing some reading on tbi engines and have found a handfull of articles that say if you install a fuel pres regulator and bump up the pressure a little bit it will greatly improve power and especially if you have installed aftermarket power adders like intakes and exhaust. Anyone hear about or have experiance w/ such??? I have an 88 burb w/ 350 tbi K&N filter sys., throttlebody spacer and 3" flowmaster catback exhaust. Thanks for any input.  

Where is the fuel pressure regulated at now? I can't see how this would even physically work, but I don't know where the regulator is or how much pressure they need.

Sounds like it's the same theory as installing a larger injector, only this is trying to force more through the stock ones.

In reality the injector should only be metering out a precises amount of fuel as determined by the computer and adding more pressure shouldn't do anything but put more stress on the system that wasn't designed for that kind of pressure.

IDK... try it and find out?  

that is exactly what i was thinking... I think my pressure is around 14 and change, so the injectors are rated for that psi... I was thinking that it may wear out the pump because your adding pressure but not flowing it faster... Thanks for the reinforcement.  

What you would need would be a bypass regulator so it would bleed off the pressure when it's not needed so it wouldn't hurt the pump. The real key would be flow, but just like any kind of liquid  you can only flow as much as you can force through the smallest opening which in this case would be the injector. So in theory without replace the injectors it wouldn't do anything...

Anyway...  

This is a bit of one of the write-ups i found. incase your interessted.
"The first performance step is  to address is the fuel pressure. GM did not set the fuel pressure exactly the same on each vehicle - they just made sure they where set between 11-13psi. A 1-2 psi difference in fuel pressure makes a drastic difference in performance! Believe us! In fact, 13psi is just enough fuel pressure for a stock tbi engine to accept one significant airflow improver (ie: our Tbi Power Plate, ported throttle body, headers, or etc.) without running into a significant lean condition.  We have found that 100% stock tbi engines enjoy 13-13.5psi and those with some modifications enjoy 14-14.25psi."
  They seem pretty knowledgeable??? lol I will try it as soon as i can and let you know the out come. I got this info on http://www.cfm-tech.com