| The 500 cams are great, and definitely make a significant impact on the car's powerband, even off boost. You will need the upgraded valve springs from JWT which will wear out your VTC cam sprockets in 5k to 10k miles. JUN has new springs that are supposed to be strong enough for the cams but do not wear out the VTC's. I have the 500 cams and just had some modified VTC's put in for testing to see how they hold up to the stiffer springs. The alternative to VTC's are adjustable cam gears but you lose some low end punch and they of course require adjustment. This is at least my understanding of it from long history with my car's build, and Specialty Z.
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1991 Aztec Red TT bought new in '91
Way back then, added JWT chip, ignition advance, Pop charger, Stainless 3pc Borla cat back; 17 in. OZ wheels
Sold 1994, 88,000 miles later, still on orig clutch; what a car 1991 Charcoal Gray TT purchased 06/05 and a heck of a lot more bang than my original. 
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14:35:15 12/17/07
