UltArc, I would also lik to see pics of the undertray you described.
If you do an EM search for vortex generators, you will find multiple accounts about their inability to show any real MPG gains. Even if one does the tuft test to find the best placement, they still find them to not be useful. I don't remember where, but I saw a guy who took some CDs and bent a third on the left and right side to make his own VG, pretty cool.
Quote:
Originally Posted by Sam Powell
As i understand it the goal of the kammback and vortex generator are just the opposite.
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Yes, if you have a kammback, the VGs are useless to you, because the kamm will allow air to stay attached for longer and force it to leave further out and down. The VGs are designed to slow down the air so that it will wrap around the back of a car easier.