Cat Delete = Better Gas Mileage?
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Old December 27th, 2010, 11:38 PM   #1
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Cat Delete = Better Gas Mileage?


Would a cat delete on a 2000 mustang gt drop my gas mileage?

Looking to cut them and replace them with pipe. Wondering if it would hurt my MPG. Also, if I don't replace the two rear O2 sensors will it effect my performance or just pop the check engine light on?
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Old December 27th, 2010, 11:48 PM   #2
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You can get an O/R H-pipe from Jegs for pretty cheap. Which is what I would do instead of hacking up the stock one.
I dunno what it would do to gas mileage because I give two-tenths of a f*ck about my gas mileage.
Use these for your rear O2s :
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Old December 27th, 2010, 11:58 PM   #3
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most likely no
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Old December 28th, 2010, 12:27 AM   #4
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Absolutely not. Your mileage will improve without having the cats clogging up your exhaust
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Old December 28th, 2010, 12:41 AM   #5
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Originally Posted by tbirdscwd View Post
Absolutely not. Your mileage will improve without having the cats clogging up your exhaust

So by this statement your saying that having a more free flowing exhaust will help my MPG?
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Old December 28th, 2010, 01:10 AM   #6
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i delete my cats 2 days after i got it n kept adding bolt ons gas milage improved then went down hill with the 4.10's lol
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Old December 28th, 2010, 01:45 AM   #7
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The back 2 o2 sensors only monitor catalitic converter efficiency. So you cel will come on but it's nothing to worry about. Buy a tuner and shut them off
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Old December 28th, 2010, 09:53 AM   #8
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I just put an o/r h on my car and my gas milage has gone down2-3 mpg but I think its because I love the sound so much I'm reving it higher before I shift
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