I am new to this forum, so if I am asking redundant questions dont beat me up.
My question is if there are any "performance parts" for the 4.0(besides air box and exhaust.) I want to get as much torque and hp as possible. Are there intakes, cams, etc? The 4.0 is in a 2003 Sport Trac. I will NOT adding a supercharger.

 

Try www.supersixmotorsports.com and also www.moranav6racing.com if you want to get deep in to 4.0 performance without going forced induction. Morana is fixing to release a 4.0 sohc stroker kit to take it up to 4.5, they allready have it for the 4.0 ohv motor. Also www.jusnesmodified.com who is a sponser here has all the 4.0 bolt on goodies like the under drive pullies and bama programer, also intakes and catbacks. The bama programer is one of the best investments you can make for adding power and torque, Doug is a ranger guru and does each tune speciffic to your truck. JBA and gibson both make headers, Bob Jusnes sells those as well.

 

Try the 4.0L forum.

 

He's allready covered, has to look no further, I've taken good care of him. "O", by the way, welcome to the site, were glad to have you. you can also ask questions on the ranger forum where I hang out, seeings how the sport trac and ranger have alot in common and it's more active than the sport trac forum, especially with 4.0 questions.