I applied aluminum tape to both sides, then used Barge cement to adhere very thin neoprene sheets to both sides. I didn’t trim the bottom main flap enough so it’ll squeak a little on power-up. Otherwise has held well.
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-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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