I have the small Roush M90 PD blower. 5 lbs of boost. LT's, catted H, and a 94 tune from VMP. Also the FRPP twin 62mm TB...and K+N air filter. 386 rwhp on my 5R5S 5 speed automatic. 370 ft lbs RWTQ.
The PD blower works off a vacuum. You can have your foot into it pretty good, and not be in boost.
The advantage of the PD blower is..... you get the instant TQ hit. With an automatic, it drops down gears, with gas mashed, then you get the combo of instant TQ, and a lower gear(s). It will slam ur head into the headrest in 2nd gear.
IF my wife was driving the car, she would never know there was a blower in the car.