Well i have noticed that some people have ASP crank pulleys and some have underdrive pulleys. Whats the difference and which makes more power?

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2000 SS Camaro
free mods, K&N Air Filter, Air Temp Module
13.45 @105.48mph on Bald Tires

 

They are the same thing. Both a crank and alternator pullies both underdrive the system. I have seen cars with just the crank pully do OK, but some cars will have charging problems if you don't do both the crank and alt pullies. I had them on my LT1 car and didn't notice that much of a difference and my belt would squeek in the summer even with a brand new belt. I got pissed buying new belts all the time and tried several diffent sizes before removing them all together.

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2002 Camaro SS #3586 6M Sebring Silver, T-top, Billet Grille, Hurst shifter, !CAGS, Whisper CF Lid, Holly PowerShot filter, Corsa Catback w/full polish tips, 160 Thermo, SLP fan switch, ASR reverser, TA axle cover w/stud kit, MAFT, NX wet kit(150)purge,heater,remote opener, FPSS,MSD WS, Autometer gages, Hotchkis STB, LCA's, APHR.

Baseline Dyno: 317.9RWHP 335.9RWTQ with MAF ends only: 325.6RWHP 350RWTQ. (Stock)1st 1/4 mile 13.46 @106.9 2.23-60'
new best 13.306 @107.89 2.12 60'
http://members.***.net/sscargo/Camaro.htm
4-sale MAF ends....now using N20 so need to ditch them.