When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
from what i hear, they are worth it... But i bet you could spend your money somwhere else and get better gains (mid pipe). If you have done everything else, then 5-10 hp for 200 bucks isn't that bad, for u/d pulleys