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Old 09-03-2015, 09:31 AM   #1
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Exhaust help

I'm getting a lethal performance off road x 3 inch pipe.

Would it hurt the car to go from 3 inches back to stock 2.75 OTA ?

Should I do full 3 inches all the way back?

Thanks!
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Old 09-06-2015, 03:35 PM   #2
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I'm not an exhaust system specialist as this is a complicated science of its own. But as far as I understand, maximum engine performance relies on a certain amount of back pressure and pressure waves timing and good exhaust systems are tuned that way. Increasing a pipe's diameter reduces gas flow, decreasing the diameter increases flow. Changing pipe diameters could affect engine performance, probably just by a small amount.

To answer your question, it won't hurt at all to leave the stock pipes installed.
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Old 09-06-2015, 03:40 PM   #3
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There is a good thread from years back explaining the science behind this. "Back pressure" isn't really the right term for it though. I do believe in a na application 3 inch is overkill
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Old 09-06-2015, 05:54 PM   #4
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There is a good thread from years back explaining the science behind this. "Back pressure" isn't really the right term for it though. I do believe in a na application 3 inch is overkill

Not really sure why you would say 3" on N/A is over kill because I made a hell of a lot of power with my 3" setup.


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Old 09-06-2015, 06:26 PM   #5
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Did you test before and after with the 2.75 and 3 inch?
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Old 09-06-2015, 06:31 PM   #6
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I haven't but I made 50+hp over stock with just exhaust and a tune.


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Old 09-06-2015, 06:35 PM   #7
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Sounds about right for a tune headers and catless. I bet the gains m have been the same or Damn near it with 2.75 though
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Old 09-06-2015, 06:38 PM   #8
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The cars getting boosted this winter and my tuner told me to go the bigger route.


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Old 09-06-2015, 06:45 PM   #9
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3" will not hurt the coyote na. 98% of aftermarket exhaust is 3" for it.

2.75 is the stock diameter



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Old 09-06-2015, 07:05 PM   #10
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I didn't say it would.. Said it was overkill for na lol. If you plan on boosting it deffinetly is the way to go though
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Old 09-06-2015, 07:17 PM   #11
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I didn't say it would.. Said it was overkill for na lol. If you plan on boosting it deffinetly is the way to go though

It's not overkill. You have to remember these cars flow a lot on the exhaust side.

A stock pair of coyote heads flow better than a full port job on a 3v.



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Old 09-06-2015, 09:23 PM   #12
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So going 3 inch exhaust you won't lose any bottom end torque?

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Old 09-06-2015, 09:36 PM   #13
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So going 3 inch exhaust you won't lose any bottom end torque?

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No


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Old 09-06-2015, 09:37 PM   #14
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So going 3 inch exhaust you won't lose any bottom end torque?

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Not from what I've seen and from what my car made on the dyno.


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Old 09-06-2015, 09:55 PM   #15
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Originally Posted by natestang07 View Post
There is a good thread from years back explaining the science behind this. "Back pressure" isn't really the right term for it though. I do believe in a na application 3 inch is overkill

Check out a thread called. Myths about "Backpressure". Started by...... ME!!!.... ๐Ÿ˜‹


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Old 09-06-2015, 09:57 PM   #16
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There is bit of a Science to it!.. Things like pipe diameter, exhaust temp, and so on!.. But 3in pipe should be about perfect for you!..


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Old 09-06-2015, 11:40 PM   #17
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There is bit of a Science to it!.. Things like pipe diameter, exhaust temp, and so on!.. But 3in pipe should be about perfect for you!..


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That was the one I was referring to. Good solid read
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Old 09-06-2015, 11:52 PM   #18
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That was the one I was referring to. Good solid read

Thanks!.. I found those wright ups a few years ago and decided to post them!.. At the time there where Several people on here Giving a bunch of False Info!.. And insisting how Backpressure is Needed, and Backpressure this and that and so on!.. Was just getting a bit Too annoying to me!.. Hahaha.


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Old 09-07-2015, 10:02 AM   #19
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3" all the way in my opinion
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