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Going to buy some Coroplast to do a full under tray. The front under engine tray I had a long time ago gave me a significant measurable increase in MPG so I'm hoping doing the exhaust channel, which is now empty since I'm only running a downpipe after the turbo and catalytic converter, will cause the MPG to go back up. I'm down to around 35-41 MPG(not drafting vs drafting) on highway with the car being lighter because of the increase in drag from the extra space in the wheel wells as well as the open space under the car.
I'm headed on a 70 mile trip tomorrow so I'll see what effect a full under tray has on this car.
Pictures to come..
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