Ride quality is important. I had a shop put adjustable struts in the front of my Superbeetle and they ordered the boy-racer part. It was so stiff if I put my elbow on the driver door arm rest, in 5-10 miles I'd have pain in my collarbone. Fortunately (
) I totaled it and got the stock spring rate back during the repair.
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I'm flying by the seat-of-pants protocol. The Superbeetle has a mechanical speedometer and electric gas gauge and two warning lights. My new-to-me pre-OBDII Dasher adds an electric clock, temp gauge and a third warning light for the glow plug. Don't even have a cell phone.
A note about the open ended kammback: You will notice that the upper half has a screen with a half-circular cutout on the bottom edge. This is a perforated base plate, halfway between open and boxed.
I saw an amazing example of what screens can do at the Darko wind tunnel. They have a wall of 2" welded wire mesh in the return part of the loop. The air goes ten feet past it, around a corner, into the throat of the tunnel and then thirty feet down the tunnel, into the test section. They got an improvement in laminar flow on the tunnel wall.
I think there is a place for perforated plates parallel to the airflow, like the louvers on a old hot rod.