I got a little bored tonight, so i went down to home depot and got a flexable piece of 3" dryer duct. (and i zip tied the hell out of it. No rubbing, no scraping, and a definate noticable increase in power. There will definatly be some more alterations to the design, but IT WORKS! Starting at 60 you can start to notice a diffrence, but crusin at 80 is awesome, and pulling from 80-120 just doesnt stop. There is some serious advantages at that speed.