I played around with that sort of thing in high school on my 4-cylinder Chevy S-10 pickup, had several computer case fans forcing air into the airbox.
I did see a slight improvement in in-town fuel economy (about 1mpg, sometimes 2) but I can honestly say that it made no difference other than that judging by the seat-of-the-pants feel.
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1976 Ford Mustang II Ghia: 302 with a 600cfm Edelbrock carb, Edelbrock Performer 289 intake, Dynomax Blackjack headers, 2.5" exhaust with Flowmaster Super 44s. RJS 11-gallon fuel cell, C4 tranny, chrome 16" pony wheels, fuzzy dice, brown vinyl half-top, and painted in the tackiest color ever (harvest gold, that's why I call it "The Goldenrod").
Also have a 2003 Dodge Ram (lightly modded daily driver/tow rig/office/dining room/home away from home/workshop... I call it "The Big Blue Dawg".)
Your money is better spent else where. Those belong on a honda civic
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2008 Grabber Orange GT premium, 5 speed manual, 3.31s
Diablosport Predator Tuner and Bamachips tunes (93 Race, Torque, and Preformance), Boom Tubes
Kooks LT headers and catted H pipe, Steeda UDPs, delete plates, UCAs, LCAs, and Panhard brace, all waiting on time to install them
don't do it...if anything the air filter and cia piping are giving you the pony increase.. not the fan
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When you own a V6 stang 3.8, 3.9, or 4.2 stroker, You're part of something different. You don't rely on a V8 to do your driving. Instead you learn the V6. You tune and tweak until you see GT's falling behind you.Then when they ask "Is that a V8?" You simply respond with a rev that clearly states "I'm a V6" with a proud smile on your face. As your girlfriend sitting on the seat next to you calls you an idiot.
Has anybody heard of these so called "superchargers"? 
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