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Old 12-28-2015, 12:58 PM   #1
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Need Some Exhaust Advice

Hey all...its been a while since Ive been here, but I need some help or advice.

I got a good deal on a GT500 cat back exhaust. The OTA pipes are 3". The place that will install it said they don't for see any issues running a 3" pipe on a 3.7. I posted on a couple of other forums, including Facebook and some say it will be a problem and others say it wont. What do some of the guru's here think about this?

Magnaflow Mustang Street Catback Exhaust w/ Polished Quad Tips 15172 (13-14 GT500) - Free Shipping
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Old 12-28-2015, 01:31 PM   #2
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Why are people saying it will be a problem? I don't see why it wouldn't fit. Is it overkill? Hell yes it is lol

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Old 12-28-2015, 01:33 PM   #3
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Why are people saying it will be a problem? I don't see why it wouldn't fit. Is it overkill? Hell yes it is lol

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Lol, love the response. I feel the same way.

Fitment isnt the issue. They are saying Ill loose too much back pressure.
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Old 01-01-2016, 09:00 AM   #4
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Just boost and it will equal out lol.


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Old 01-04-2016, 11:36 AM   #5
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If your using the gt500 cats you'll be fine. U are going to lose some back pressure which will drop off some torque at the lower end. Hp should only drop a bit. Probably would not notice it for daily driving. This will not affect the longevity of the motor.

Personally I would not recommend doing this just because of the loses. Yours going to be losing back pressure which can be a good thing but in this case I feel that your losing to much and won't be happy with the results. The factory exhaust is restrictive. But only in certain spots. Factory size is good for these motors up to around 450hp asking as you remove the restricted spots. Such as the cats.

Just my .02 but I would not run a full gt500 setup. If your stock and wanted to run just the axle backs from a 5.0 sure that's fine. But I personally wouldn't run the whole system.
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Old 01-04-2016, 01:00 PM   #6
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Quote:
Originally Posted by Socal Stangman View Post
Hey all...its been a while since Ive been here, but I need some help or advice.

I got a good deal on a GT500 cat back exhaust. The OTA pipes are 3". The place that will install it said they don't for see any issues running a 3" pipe on a 3.7. I posted on a couple of other forums, including Facebook and some say it will be a problem and others say it wont. What do some of the guru's here think about this?

Magnaflow Mustang Street Catback Exhaust w/ Polished Quad Tips 15172 (13-14 GT500) - Free Shipping
You could try this site. The guy answers a lot of exhaust questions. Just post your question.
Do After-Market Exhaust Systems Really Work? - Exhaust Videos | Exhaust Videos
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Old 01-15-2016, 12:25 PM   #7
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GT500 cat back will lead to a low back pressure from your 3.7 engine as the pressure that will goes out of the GT500 engine is much higher from the 3.7, don't do it and keep the OEM one.
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