Hi,

 

I have the 2 piece March but havent driven the car yet. It seems more throttle responsive. march claims a 10-15hp at the wheels. Who knows though.

Yes the prom will make a difference, I have the Ed Wright stage 2. It cost $159. www.fastchip.com

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91 Formula
305 TPI 5speed
1LE/G92/WS6
Cold air ind. w/K&N, SLP airfoil, ported/polished plenum, March pulleys, TB coolant bypass,Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires, fastchip, Bosch O2sensor, SLP headers & catback,short shifter,3:73s w/Auburn posi,160* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

Also, go with an aftermarket catback (preferabbly straight flow muffler). I like Borla or SLP. All stainless steel

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91 Formula
305 TPI 5speed
1LE/G92/WS6
Cold air ind. w/K&N, SLP airfoil, ported/polished plenum, March pulleys, TB coolant bypass,Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires, fastchip, Bosch O2sensor, SLP headers & catback,short shifter,3:73s w/Auburn posi,160* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

I got the 3 piece pulley set and I liked it. Maybe 5-10hp. Its a helper mod.

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Eric Natzke
91 Firebird 305 TBI

ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-180 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-MSD Cap & Rotor-MSD Blaster Coil-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone-Free TBI mods
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

dude, skip it. DO real mods, like headers, exaust, gears, intake, cam etc...pulleys are for the last, when you are like running border line and you already did everything else. EX: let say you car runs 12.10, then spend 50 bucks for pulleys in hope you run 11.95 my 2 cents, of course...I've been there...and what really works are gears and intake/heads headers/exaust.

good luck...your times are good for a stock car...I wish my 85 could run 99mph with all my mods...snif

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85 Z28, 355, edelbrock base, SLP runners (old style) 58mmTB, ported plenum, stock cam, fuel reg, TES headers, flowmaster, 3.73's, shift kit, MSD 6a, 305 hypertech chip (YUUUCK!) best prior intake mods: 14.6 @ 94, 2.02 60' temp: 78deg, 80% moist, on radials.
69SS, black, 3,73's, TH400, 402 BB, roller everything (solid 246@50 622 lift)+stud-guirdle, 67 Vette heads ported and o-ringed, about 10:1 cr KB pistons, should be done this summer, goals: 500hp and lots of fun

 

Thanks

 

see my sig for some ideas.

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1990 Trans Am GTA
Bosch plat+4 plugs,SLP plug wires,Hypertech coil kit,Fastchip PROM,SLP 160 therm,T-body bypass,SLP crankpulley,Breathless AFPR,,ported plenum,SLP runners,SLP flowbooster,SLP cold air,K&N,SLP 3"catback,SLP torqueconverter,SLP shiftkit,Mobil 1
14.3@96 stock
13.5@102 w/mods