[lunarhighway]

i've recently completed stage 1 on my rear undertrat/diffuser that basically covers the area behind the rear axle up to the rear bumper.

this leaves the area behind the rear wheels uncovered. part of the problem covering this is that the rear wheel wells are open at the back.

i'm wondering if there are aerodynamic reasons for this design, as air can vent into the space behind the rear bumper (wich is relatively high) and excape further to the middle of the car.

i have a few options

-leave things as they are and place fences at the side of the existing undertray

-continue the undertrat and make it flush witht the bumper and extend the wheel wells so no dirt gets on the tray

-continue the undertray but curve front of the parts behind the wheel up so they meet with the curent wheel well, creating something ala reverse break cooling duct on race car undertrays

-build full rear wheel boattails (not likely to happen)