I put in an AEM brute force intake, 20 min install, 3 bolts, 3 hose clamps and 2 beers.
the intake tube is much larger than stock, didn't measure but I think it looks close to 65.5 inch Dia. gives a very deep throughty (spelling?) sound, when you are on it,friend says it makes it sound like a Vette, but reasonabily quite when cruising.
I felt like it made a difference in accel (hard to tell, my butt is not that well calibrated, but the mileage to and from work seemed to have gone up about 1.5 MPG or so. (I drive the entire length of the 605 every day ~38 miles each way)
I like the looks of the Air raid air box, I will try to take a picture or go to
http://www.aempower.com/truck/product_intake.asp
H2 Black Lux, Air Suspension, AEM Intake, soon to be blacked out...
Black 02 Fatboy
300ZX TT 500Hp, 10.5Sec completely Blacked out, Wolfe Sport 600 Turbo, Billet Aluminum FlyWheel, Carbon Claw RPS Turbo Clutch, Dual Pop Intake, HKS Intercoolers/Exhaust