Three cats on my 2011 Silverado!
#13
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Corvette & Mustang Moderator
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Joined: Nov 2001
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From: Sugar Land, TX
Yea, I didn't really feel anybody would really know. Has to help though anytime you improve flow. Would only be concerned with the additional sound after gutted. It's really nice and quite now and don't want loud.
#14
Joined: Oct 2004
Posts: 4,985
Likes: 54
From: somewhere in TX
I felt no difference when I ported the third cat on mine. It did make the exhaust a bit little which is what I wanted and why I did it. It is installed after cat to do a final clean up on anything the main cats missed.
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