Has anyone ever done this BIGG BOOST mod to their truck?...i saw it on that powerstroke guy's youtube videos but when i found it on ebay it said it was only for the 99+ trucks.

Also i have a 6" lift and 36" swampers on my truck with 16.5" wheels dual 5" stacks 4" dp & K&N. I wanna go a little more conservative because ill be driving a half hour to work everyday. Its either do some mods to drive this truck or sell it for a 4 banger. Whats the best suggestion? I know 16.5 tires are going out of style but i love the truck...i wanna know what size to go but not make it look like a huge lift with tiny tires