Originally posted by Randy
I'm putting together my finances right now for an Allen Supercharger for my rig. I do quite a bit of heavy towing and would like to see the added hp at the rear wheels. Pretty embarassing from a dead stop. The truck doesn't really hit it's stride until about 2800 - 3200 rpm.
If you go with the Allen, I'd make sure it's an M112 or larger blower.
IMHO the M90 blower that Allen used to use is too small for the 5.4. I've never seen rear-wheel HP numbers exceeed 280 on a 5.4 with an M90...they just run out of breath and intake air temps rise because they are overdriven...which hurts power and can contribute to detonation. Torque is good, though.
For comparison, an M112, which is what a Lightning uses (and can be put onto your 5.4 just as easily with a kit) will put down about 360hp to the rear wheels.
I think the Lightning blower swap is the best, most cost-effective blower for the 5.4 when you look at the reliable power that they put out.