Running high flow cats without a tune for 3-4 days - Mustang Evolution

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Old 07-01-2016, 05:54 PM   #1
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Running high flow cats without a tune for 3-4 days

A shop is installing a high flow catted H pipe on my 2014 5.0 with the pypes high flow metallic converters and my tuner won't get here until Tuesday, I was wondering if they will get damaged driving on them for a few days maybe like 100-150 miles. If that is too many miles without a tune I will just drive it home from the shop and leave it in my garage until the tuner get's here. 20 Miles shouldn't damage them right?
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Old 07-01-2016, 06:09 PM   #2
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Running high flow cats without a tune for 3-4 days

Nope. You're fine
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Old 07-01-2016, 06:22 PM   #3
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Nope. You're fine
Okay cool haha hopefully they are good for a few days without a tune. Thanks for the feedback
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Old 07-01-2016, 11:48 PM   #4
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Originally Posted by kaveh14GT View Post
A shop is installing a high flow catted H pipe on my 2014 5.0 with the pypes high flow metallic converters and my tuner won't get here until Tuesday, I was wondering if they will get damaged driving on them for a few days maybe like 100-150 miles. If that is too many miles without a tune I will just drive it home from the shop and leave it in my garage until the tuner get's here. 20 Miles shouldn't damage them right?
What kind of H did you have installed? Are you happy with the results. We're you going for sound, performance, all of the above? What do you feel is the difference from the stock H?

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Old 07-02-2016, 05:52 AM   #5
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You will be fine. It may trigger a CEL but you can just clear it when the tuner arrives.
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Old 07-02-2016, 08:00 AM   #6
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What kind of H did you have installed? Are you happy with the results. We're you going for sound, performance, all of the above? What do you feel is the difference from the stock H?

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JBA 3 inch to 2.75 inch h pipe with pypes high flow metallic cats welded into the cat delete pipes. I haven't gotten my car back yet, I pick it up today. I mainly want sound but performance is welcomed. I'll let you know how I like it as soon as I pick it up
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Old 07-02-2016, 06:03 PM   #7
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Absolutely love it. Couldn't be happier, it does crackle and backfire a bit but I like that and whoever says high flow cats don't add volume are lying. Easily 15-25% louder sounds so much deeper and throatier. If I were someone who wants more volume and a better tone out of their roush axle backs I would order the parts now haha that's how much I love it. As far as performance not a huge difference but you can feel it open up a little bit however once I load the tune onto the car I'm sure I'll tell a difference.
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Old 07-03-2016, 06:49 PM   #8
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I've always been an advocate for high flow cats. It keeps the bass in the exhaust note without sounding overly poppy / raspy / crackly.
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Old 07-03-2016, 08:00 PM   #9
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Anyone have experience with emissions using high flow cats? I'm in Wisconsin and we need to test every two years.

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Old 07-05-2016, 12:58 PM   #10
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Can you run high flow cats without a tune?
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Old 07-05-2016, 12:59 PM   #11
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Can you run high flow cats without a tune?
Definitely not for a prolonged period of time because you will burn them out on the stock tune after a little while. I've heard of people going a month or two with no tune but even then that's not the best idea, a week or two shouldn't do much but you need a tune for sure the sooner the better
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Old 07-05-2016, 02:55 PM   #12
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Definitely not for a prolonged period of time because you will burn them out on the stock tune after a little while. I've heard of people going a month or two with no tune but even then that's not the best idea, a week or two shouldn't do much but you need a tune for sure the sooner the better
I've gone years with no tune and haven't "burn them out".
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Old 07-06-2016, 12:51 PM   #13
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Anyone have experience with emissions using high flow cats? I'm in Wisconsin and we need to test every two years.

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Fellow Wisconsinite here. 'A guy I know' has been having success using spark plug defoulers to pull the rear O2s out of the exhaust stream and telling the tuner to keep the rear O2s ON in the tune so the computer doesn't generate any readiness codes.

Best thing that happened to us in WI is when the DOT switched from the sniffer test to the OBD-II scan only.

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