Sounds like a cat rattle to me as well. Long as the truck is not 10 years old
or over 100,000 miles they have to replace it whether they like it or not. As
long as you only did a catback exhaust. If they give you any guff about it,
just remind them that it's a federal law.
Doug Myers wrote:
> Hey everyone,
>
> Just wondering if anyone might be able to help me..... When I first
> start my truck in the morning, or anytime its "cold", I have a very
> pronounced rattle coming from my exhaust. This goes away when the truck
> begins to warm up. You can hear it out of the tailpipe, and from directly
> underneath the cab. Any idea what this could be? It sounds like it might be
> coming from the catalytic converter. If it is the cat, what are the chances
> of the dealer replacing it under warranty with a modified exhaust?
>
> Thanks,
>
> Doug Myers
> '99 Dakota RC/SB 318/5-speed/3.92SG
> F&B 'Stage I' Throttle Body
> Turbo City Dual Inlet Air Tube
> MP Cam/Lifters/Valve Springs/Retainers
> MP Double Roller Timing Chain
> MP Cast Aluminum Valve Covers
> MP Headers
> MP Cat-back exhaust
> Continental Hard Tonneau
> BFG 275/60R15's
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