Cat,? what cat lol If it was me I would do from turbo back all pipe no muffler or anything. Ive done lots of work on diesel trucks for friends. Exhaust, intakes, particulate removal, egr delete kits all that crap. A good website to go check out is Rollin Smoke Diesels they have all the brands and are priced pretty good that's what website I've always ordered my stuff from. (for diesels of course) lol
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