What should I mod next?
 

I have an 06' 5.4L with 3" Air Force 1 intake, and SI/DO aero turbine 3030 exhaust. I'm looking for some ideas as far as performance upgrades to compliment the gryphon. Any good ideas for the more power for the money?

There are several things that come to mind, long tubes, UD pullies, e-fans, high flow cats. That's about it for bolt ons before forced induction. UD pullies are probably next on my list.

What could I expect out of underdrive pullies? I already sent in my order for a custom tune but I know it will take Bill time because he is busy and if I can get some decent gains I'll put some in and see if I can change my order.

how do these look? They're the cheapest I can find and I don't know the difference between these and the ones that troyer performance or anyone else sells.

5-8 HP is what we've seen on the dyno, but of course that's with a huge fan pushing 60 MPH air through the radiator so the load from the fan really wasn't accounted for.

Many people who have run the pulleys have said they notice modest gains in economy as well as a little more pep when driving. If nothing else, just think of how much less wear on the bearings and other components in the belt-driver accessories. That alone makes it worthwhile.

Hope this helps.

I forgot to post the think:

http://www.car-stuff.com/fordpulleys.htm
and
http://www.rpmoutlet.com/f150asp.htm

what do you guys think?