GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

Three cats on my 2011 Silverado!

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Old Dec 23, 2011 | 07:38 AM
  #11  
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Anybody know if the engine will make more power with it gutted or deleted?
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Old Dec 23, 2011 | 08:16 AM
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Nobody has done a back to back dyno pull or claimed a noticeable change on the butt-dyno. Cant hurt performance to remove it though and some have said it did make the exhaust a little louder.
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Old Dec 23, 2011 | 08:32 AM
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Originally Posted by Robert91RS
Nobody has done a back to back dyno pull or claimed a noticeable change on the butt-dyno. Cant hurt performance to remove it though and some have said it did make the exhaust a little louder.
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.
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Old Dec 23, 2011 | 11:24 AM
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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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Old Dec 23, 2011 | 11:44 AM
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A little rumble might be a good thing! It's so quite now.
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Old Dec 23, 2011 | 02:32 PM
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I also have the large case magnaflow in place of the OE muffler sounds nice without the 3rd kitty.
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