It will not hurt the engine at all. It will be slightly louder, not annoying though. Problem is, if you keep the cat it will do nothing for performance or egt. Dump the cat, they don't work well on diesels anyway.
2009 King of the Hammers
BUCK Wild Racing
Co-driver: Pat Quirk
Rover Tracks www.rovertracks.com
DJ Safety www.djsafety.com
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Reel Driveline www.reeldriveline.com
Made it further than half of the other guys, but the Hammers won.