Not planning on any sealing per se. Just going to keep it as close to the car as I can. The diffuser's front edge is pretty close to the lower surface of the bumper. I don't think there's a lot of high-speed airflow there, as it's right behind the rear axle and muffler. Take a look at it come Labor Day and tell me what you think.
I'm planning to eventually install a rear belly pan which will help air flow transition onto the boat tail.
But it won't happen before Labor Day.
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-Terry
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