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I have the Fantastic vent covers that were made for the Fantastic vents and have been using these covers for at least 25 years. In addition to those, we use the square cushions pushed up into the opening from the inside. LOL, cummins; no heat intrusion.
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'17 36RSSB3///2012 F350 KR, LWB/SRW, Bilsteins, antisway bar, Bilstein steering stabilizer, Airlift air bags, wireless compressor, 295/20 tires at 4080 pounds each, oversized finned aluminum diff and trannie pans, synthetic fluid, KEM, PIP, & Tyrant tunes w/SCR4 programming, Edge CTS gauge monitoring, G37 2017 turbo, ATS Stage I transmission.
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