There BS. I have seen then and what they say in literally unbelievable and some have bought them and said it was a waist of money and did nothing. If they were legit, wouldn't we all have them?
2004 Rumble Bee #1546 4X4
Performance: Super Chips 3865, K&N CAI, Edelbrock Shorty Headers, Dual Exhaust with 18" Magnaflow Muffler and Y-pipe, Power Wire, Sonnax Line Booster, Jet 180* t-stat, Taylor 8.2mm Shortie wires, Flex-A-Lite 183 E-fan, Grounded TB.
Appearance: 22" Black BOSS 334's wrapped in Nexen Tires, LED Tail Lights & Third, Shorty Antenna, Honeycomb Grill, Tint:5% Visor and Rear Window, Deadged, Retro'd 8000k Projected HID Headlights w/ SMD Halos, 3000k HID Fogs, Switchback LED Turns, Full LED Bulb Swap, Snugtop Tonneau w/ Stripe Extensions & 1546 in Stripe
Other: Kenwood KDC-X994, Pioneer 5ch amp wired to 2 10" Diamond Audio Subs in a custom ported box and 2 Kenwood Door Speakers, Husky Floor Liners, Push Button Start.