Best Supercharger 4.6L

[brentmcq]

Thanks for all the advice. I'll consider Vortech vs. Procharger.

[duplox]

Air-water is far superior for drag racing. No contest. You can easily achieve 100%+ cooling efficiency with an air-water, and in a tighter package than an air-air. Water has a higher ability to absorb heat per volume as compared to air, so it needs far less surface area to contact the air, hence the smaller packaging. I'll break it down into a little list for ya:
Air-Water
Pros:
Small packaging
100%+ cooling efficiency possible for short bursts
Only a small cooler required in front of radiator
Off boost, the intake air has the effect of cooling the water
If you use ice water, cooling is independant of ambient air temps
Cons:
Water is heavy
Under extended boost periods(ie any kind of racing other than drag), the small cooler up front is unable to return the water to a appropriate temperature - therefore, intercooler becomes ineffective.
Much more complex and expensive than an air-air.

Air-Air
Pros:
Simple
Widely available
Fairly inexpensive if you scrounge in the junkyards
Does a good job at cooling
Cooling ability in independant of the ammount of time under boost, good for endurance applications
Cons:
Unable to achieve 100%+ cooling efficiency
Rather large packaging
Cooling ability dependant on temperature of ambient air.

I probably missed some, but that should help clarify a bit.
So basically, if its for a street car, it depends on two things:
1. How do you drive a car?
2. What do you have space for in your car?
If you drive like a maniac under boost all the time, get air to air. If you just cruise except when the occasional hotshot pulls up next to you revving their motor, get air-water and let 'em have it.

[brentmcq]

Okay one last question. I live in Phoenix which is one of the freaken hottest places in the country. We have summer time temperatures between 100 - 123 degrees. Typical temp ranges in the hottest part of summer are between 110 - 115. What good does an intercooler do at those temperatures? The air is just plain hot which sucks on performance. Side note: back in 1995 it hit 123 degree and my 1.9L Ford Escort had a hard time getting traction because the asphalt was melting (it was like driving on icy roads). True story.

[duplox]

With those temperatures, I'd recommend alcohol injection and/or air-water intercooling. At least with air to water you can put in ice water and get 15 minutes of good power out of it, then use the alcohol injection for anything after that.
http://home.att.net/~alkycontrol/
There is a site about alcohol injection, they offer kits as well.. too pricey for me, I'm buildin my own.