I have read somewhere that the alternator pulley does have a clutch in it, but I can't remember where. I gather that a EH2O pump with a Steeda UDP set up is good for about 10-15 hp. You just have to buy a 99 1/2" belt. I would like to do this after I get my CAI and x pipe installed.

 

OK, for those that have done both at some time, which would be best to do first; underdrive, or jumt to the e-pump?

 

go with UDP first. there really isn't any power in the eh2o pump(5hp maybe?). the underdrive pulleys are worth about 10-15hp.

 

I can't wait to get the pullys; it just making my wife realize that they are important to have. do they provide better gas mileage?

 

I tell my wife everything I do to my Mustang helps with gas mileage.