From what I have heard on here guys really like their Dinan superchargers. I think it is a bit expensive for the gains you are getting. I had a supercharger on an Expedition. Off the line the difference was neglegible. From 40-120 mph wow.... that is where the supercharger really kicks in, at the upper rpm range. All in all I thought it was a waste of money. It was not enough kick in the pants off the line where I really wanted it.

If you are really thinking about performance, why not sell the 4.4 and buy a 4.6?? Right there you would gain 60 hp!! Put on an intake, exhaust and a chip and you will be at 370 - 380 hp, 100 more than you have now!! That is a huge difference. Figure $500 for the chip, $1,700 - $2,300 for the exhaust and $300 - $600 for the intake.

Why on the Dinan website, in the description of the supercharger system, does it state that the hp and torque for the supercharged 4.4 and the 4.6 are the same? 451/439?? The torque chart it shows a top torque output of 404 ftlbs? It would make sense that the supercharged 4.4 would have less hp and torque than the supercharged 4.6.......