Not a Forester owner, but our last RV was a gasser on a Ford chassis so I'm familiar. You should be able to get some foam sealer rod that's adhesive on one side and will compress to seal the crack. You definitely do NOT want the crack open! You could easily wind up pulling exhaust fumes into the coach, not to mention the heat and noise issues.
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2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!
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