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power increase

  1. 5.0L Tech
    Hey guys, I have a 66 fastback with a 1990 5.0L H.O. in it. Looking to do some of the basic mods to it considering its stock besides the exhaust, K&N filter, and no smog, no a/c, no power steering. my question is would underdrive pulleys make much of a difference considering its only turning...
  2. 4.6L Talk
    hi, i just bought a 2002 gt that already has alot of bolt-ons: it has a K&N cai, bbk headers, an accufab throttle body and plenum combo, magna flow xpipes, and a diablo predator sports tuners. i was wondering what else i could do to increase the horsepower without spending a few thousand.