My buddy has an s4. He is always modding this thing up. He came accross a new mod where you empty the windshield wiper fluid and fill up tank with a mixture of water/methanol. It's actually a kit you can buy. A hose is then ran to the intake spraying this liquid into the engine when it sucks the air. He said he's going to get 30 hp out of this thing. Has anyone heard about this kit before? His he full of crap?