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Discussion Starter #1 (Edited)
Just curious if anyone found a replacement that yeilded better mpg and performance. I ask because I think mine is rattling and may be going bad.
Thanks
 

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Discussion Starter #3
Danny,
I doubt if a 4.7 can create enouph back pressure to overwhelm the stock catalyst.......maybe around 5000 rpm but thats about it.

If there is no physical damage to the catalyst shell they are covered under the 8 yr. 80k emission warranty.

Rob
I wasn't aware of such a warranty... good news. Thanks Robby
 
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