Originally Posted by fast99tl
They aren't as bad as everbody been saying they are. You can usually expect about a 10 horsepwer on some cars a 20-25 horsepwer gain can be evident.
lol, and the tornado really adds hp too.
I've never once seen an actual dyno chart of before and after (pulleys) that showed a gain of more then about 3whp somewhere in the powerband. I'd say at best expect 1whp from adding those pulley's.