BlackBird305

anyone have 'em?...any noticable performance gains?...worth the $?...thanks

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91 Pontiac Firebird...305 TBI
black, t-tops, auto
K&N 14x3 open element air cleaner, 3 inch high flow cat, 3 cat-back into a flowmaster 80 series, IAT Resistor, ultimate TBI mods, Hypertech Thermomaster Chip, TC lock-up switch...SOON TO COME...SLP Torsen Posi unit w/3.42's or 3.73's and Edelbrock TES headers
System..Kenwood 45x4 head unit, Pioneer 5.5 3-ways, Infiniti Kappa 6x9's, Two JBL 10's in a sealed hatchbox, Two Kenwood 350 watt amps

CleanRS

Got em, love em. You have sound system so I would consult some of the sound experts of the forum. They are good and I have enjoyed mine.

killer89transam

I paid i believe 100 and something for my power hypertech power pulleys and installed them myself and i didnt notice anything different. If i had the 130$ i would have spent it on something else now. Like an open element air intake or some other small mod that is necessary and worth the buck. IMO not worthwhile.

Raymond 5.7 89 Formula

I have the Hypertech pulleys on my car. It does go to discharge a bit at idle. I have two amps a 250 Watt Hifonics and a 150 Watt Aura. My car is not a daily driver if you sit in traffic a lot you might just want to replace the bottom pulley. The pulleys do not actally add horsepower but free some up instead. It is not a major mod but it adds up when you do all the other little things.

91RedBigFinZ

Ive got em and think they are worthwhile - every little bit counts. Both pulleys are needed though to keep the alternator running fast enough at idle. I had a sub when i first got them and had no problems. Doug

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'91 Z28 - 50,000 miles. All power options leather. 350 TPI:
K&N; Fastchip; Airfoil; Custom 'Ram-Air'; SLP Headers; Slp Runners; Borla Catback 50% open; Dual factory Cats; Poweraid TB spacer; March underdrive pulleys; Accel Extreme 9000 wires, Accel coil; Hypertech rotor & cap; NGK platinum plugs; manual fan switch; TB coolant bypass; Pirelli P7000 Z245/50/R16 all season tires; Energy suspention motor mounts; smog pump delete.
S Cobra Radar Detector; Z28 SS Floormats