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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
To add to the thread, the spray foam is also their to add more regidity to the chassy. Seen lots of guys @ the track spray the sh*t out of their gutted track cars for this very reason.