I also am thinking of the underdrive pulleys, and the Efans as well, is there anyone that has done both? If i go through Troyer Performance it will cost about $700 for my 05 5.4 F-150 if i get both. So if i got just one which would be the best gains for the money? the fans are around $430 and the pulleys with the belt are about $260. Or if there are any improvements in that price range let me know! Thanks
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