I have steeda U/D pulleys on my 98 Cobra. I did not notice any gains from the install and was considering swapping them to the MM (provided they are the same part number..I havent checked yet). If they are not interchangeable, I would probably get a set anyway. I got nice results from a March set on my ole 97 Mustang GT.
Are U/D pulleys ok on trilogy equipt cars?