Thankyou for the input guys, going to do some Cad work(cardboard aided design) the poly i bought is to heavy for what i want.
I was going to do an 8" airdam but i am going to settle with 6" garden edging. Grill block next, this is where the card board comes in. I will want some feed back. Goal is to keep my 16mpg for the winter then 18/19 next summer.
