[PWR_RYD93]

I gained an honest 1.5 - 2 psi when I switched from the crappy Vortech supplied flexible hose to the 4" Anderson power pipe. I saw the increase across the entire 3000 - 6250 rpm range. My setup back then was:

stock '93 short block
Edelbrock 6037 heads
GT-40 intake
70mm TB
Vortech S-trim (stock 3.33" pulley)
Pro-M 77mm
Anderson B-2 cam
1-5/8" shorties
2-1/2" off-road H pipe
2-1/2" Dynomax Super Turbo cat back

I didn't do a "with/without" test after I stepped up the impellar speed (2.95" pulley), but Rick Anderson said the power pipe would be more beneficial the harder I spun the S-trim. BTW- I saw a solid 15 psi at redline with the 2.95" blower/7" crank pulleys and power pipe with the above combo.

I'm still using that same power pipe... I just had to cut, rotate 90 degrees, and weld it to fit with my driver's side mounted Novi 2000 Renegade setup.