What kind of supercharger is best
 

What kind of supercharger is the best for a 4.6 gt. Vortech, paxton, procharger, or what. And what kind of hp and torque will it make.

I would go with the Vortech A-trim or S-trim. I wouldn't run to much boost because I know they are knowen for melted pistons.

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87 Gt with 4 inch cowl hood, dark charcole grey, long tube headers,off road h-pipe, 2 chamber flows,BBK cold air intake, Mass air coversion, Cobra 70mm MAF, 1 intake spacer,180 thermo., MAC underdrive pulleys,Pro 5.0 shifter, and a King Cobra clutch,Crane adjustable fuel press. regulator, Mac Strut and Tower Brace, Lakewood Lift Bars,50/50's, Steeda subframe connectors, 4.10's.
Best time 13.49
Best MPH 102
Best 60' 1.816

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How about powerdyne? they are supposed to be silent and also are self lubricated so they dont require an oil feed.

Sorry, but powerdyne are suppose to be the biggest peices of junk. Just look up some previus post about them. I think that just about everyone on here got rid of theres because it keep breaking belts, or it just broke.....

Aren't you overlooking something??

What about the SVO (or FRPP) blower?
It won't give you the top end like a Vortech or Paxton, but you'll have gobs of low-end torque. Which would be nice on a 4.6.

I would get a Vortech and turn the boost up to about 12 psi. Everyone says this and says that about too much boost. I have been running 12 psi for over 2 months hitting 12 psi everyday and nothing is broken and the car idles like stock. You can break the engine just as easy with 8 psi if it detonates. The SVO is a nice choice, but my only problem is it can't be intercooled. During the Summer after a few blasts, the intake temperature must be through the roof. I plan to add an Intercooler and turn the boost up to have 12 PSI of intercooled boost which will have the car run much more efficient and you can add back timing & lean the fuel mixture to make even more power. We will see how important an intercooler is when the Prochargers start hitting the scene.

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99 Silver GT
4R70W, Borla Cat Back,
SHM Slotted Rotors, custom 10.5" ProTorque 2600 stall converter, Transgo Shift kit, Redline Synthetic ATF, Cooler, Bassani X-Pipe, Vortech V2 S-trim, 3.73 gears, 70 mm T/B, Mac Adj. uppers & lowers, ROH ZR6 17X9.5 & 17X8.5 with Nittos, BBK(Walbro) 255 pump & FMS Shorty Headers, D&D Tubular K-member, Coil-overs, & A-arms. Currently running 3.33 pulley at 12-13 psi with AFM powerpipe, but not dynoed yet.
Dyno:
316 rwhp
332 rwtq
Dyno 3/26/00 After fuel mod, FMS headers & Pro Torque Converter.(RUN #6)
338 rwhp
342 rwtq

I've gotta jump in on the SVO/FRPP vs centrifugal talk.
Eminent18
It's all dependent on how you will drive.
Street -SVO/FRPP or SALEEN roots blower
Strip -Vortech, Pax etc...
How are you going to use your S/C?

more than $.02