He means Unorthodox offers an "Underdrive" pulley. It replaces the stock crank pulley. They weight less than stock, and are usually smaller in diameter.NiSentraGXE2k said:i know that unorth makes just one pulley for the 1.8L. its the crank pulley which gives u about 5-9 HP. but i ahve never heard of underdrive? is that a company? is so who makes the whole 4 pulley set for the 1.8L.
Dude, Underdrive is not a brand that I've heard of. That's just what they're called...underdrive pulleys.chimmike said: