SCAM! I bought one when I first got my truck, The device has a void if removed sticker on the back and it happened to peel of about 2 days into having it. Ofcourse I had to open it up so I was planning on taking it off anyways. The inside is a similar material to JB Welb but only black in color. It seems to me that it probably is the only thing inside the little box. I never noticed an increase in my truck.
__________________ 02' Tundra V8 Access Cab 2WD
Current: Bilstien 5100's All the way around (Fronts on top notch for level truck), 265/75R16 (33") Hankook Dynapro A/Tm's, Newly Painted (Bedliner Paint) Bed Rails
Future: Build/Install Custom Box, JL or Kicker sub, New Mids and Tweets, In-Dash Screen, Navigation, Seat Covers, Aftermarket Replacement Bumper, Get Bed Rhino Lined, Aftermarket Rims and whatever else I can dream up! hehe
Has anyone try this
ON 
Linear Mode
