I used this RTV red silicone gasket maker for my side exit, it's still fine 2 years later. I think it remains flexible unlike exhaust paste.
https://www.ebay.co.uk/itm/ABRO-RTV-...E/271799952280
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MY97 940 CD LPT Super Sports Edition 2 Turbo, Midnight Purple, 175,000 miles.
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