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3 inch exhuast good or bad?

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Old 08-25-2014, 03:50 PM   #1
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Default 3 inch exhuast good or bad?

I'm thinking about installing a 3 inch cat back exhaust I already have the gt500 mufflers on my car. would I be loosing a lot of back pressure and loosing some performance or would I actually gain anything?
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Old 08-25-2014, 04:38 PM   #2
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zero gain. your stock 2.75" piping is already pretty much too big for your GT. The GT500 uses the same 2.75" piping your car already has. You'll need around 500hp to even consider the need to go bigger than 2.5", and 2.75" would need north of 650hp. 3" would be good until over 800hp. you're at half of that roughly. it's overkill. Even at those numbers (650rwhp for 2.75" you aren't leaving much on the table not going bigger. you could in theory go down to 2.5" piping and have enough to support your GT.
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Old 08-25-2014, 04:57 PM   #3
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You will not gain anything in performance but your sound will be a bit deeper.
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Old 08-25-2014, 05:06 PM   #4
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Ok thanks for the info what about headers is that something to put money into or factory ones are good enough
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Old 08-25-2014, 10:52 PM   #5
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our cars have factory shorties. do them if you have a hole burning in your pocket. you can spend a lot of money to make a minor gain N/A, but all of it only gets really awesome if you have a power adder.
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Old 08-26-2014, 01:38 AM   #6
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What do you mean by power adder?
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Old 08-26-2014, 04:21 AM   #7
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power adder= Supercharger, turbo, nitrous. As far as headers are concerned. You'll see aprox. 20 Whp.gain. Have you tuned the car yet?
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Old 08-26-2014, 07:25 AM   #8
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If you're going to do headers at least do long tubes.
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Old 08-26-2014, 09:35 AM   #9
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No I haven't tuned the car yet I'm new to v8s so trying to learn the best ways to ad power without supercharging it or turbo
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Old 08-26-2014, 11:08 AM   #10
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Longtubes are an excellent addition to a N/A or boosted mustang. They have a decent amount of power and sound to be gained. Shorty headers dont really do much for you. I mean if you are going to go through all the trouble of getting under the car, unbolting the factory headers, tuning it (which is 100% necessary), and bolting new headers up, then go ahead and go the whole 9 yards and get the most out of ur time and money. Get longtubes. preferably ceramic or natural finish. its not really an easy install either.

added bonus: its awesome to open ur hood and show who ever those longtubes going down the side of the engine.
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Old 08-26-2014, 12:34 PM   #11
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Thanks
Who do you guys suggest for tuning in California or should I just get a programmer with tunes installed on it
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Old 08-26-2014, 01:12 PM   #12
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Dyno tunes will always be a more accurate and custom way of tuning a vehicle opposed to buying a tuner from say, american muscle, and having them put tunes on it before they ship it to u. However, not everyone (me included) has access to a dyno tuner very close. dyno tuning usually costs more than a tuner also.

I got a tuner from american muscle with tunes installed on it and i have never had a problem with my car. its fast, pulls hard, and runs just fine. just my 2 cents
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Old 08-26-2014, 01:56 PM   #13
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What's the average price of a tuner with tunes installed on it with my experience tuning a car usually costs about $800 but I've been dealing with euro cars this is my first American v8
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Old 08-26-2014, 03:41 PM   #14
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Quote:
Originally Posted by cema93 View Post
Dyno tunes will always be a more accurate and custom way of tuning a vehicle
Actually not on the 2011 up cars. Dyno tuning is a thing of the past. Data logging a tune on the street is now the way to go.
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Old 08-26-2014, 03:48 PM   #15
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Quote:
Originally Posted by scottmach View Post
Actually not on the 2011 up cars. Dyno tuning is a thing of the past. Data logging a tune on the street is now the way to go.
is this in any reference due to the fact that our cars now basically have a wideband from the factory?
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Old 08-26-2014, 04:22 PM   #16
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to buy a tuner with tunes on it runs between $350-$600 ish depending on how fancy ur tuner is.
Here r a bunch of choices:
http://www.americanmuscle.com/2010-m...ps-tuners.html

Here is a popular choice:
http://www.americanmuscle.com/x4-cus...er-2011gt.html
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Old 08-26-2014, 05:50 PM   #17
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Quote:
Originally Posted by TheDivaDanielle View Post
is this in any reference due to the fact that our cars now basically have a wideband from the factory?
Yes. Here's a good read.

http://www.mustangandfords.com/how-t...?__federated=1
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Old 08-27-2014, 09:06 AM   #18
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What about the sct programmer are those any good?
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Old 08-27-2014, 09:51 AM   #19
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Yea definitely go with a basic bolt-ons(exhaust, cold-air intake, intake manifold etc...) and then a tune to get some more power out of the engine with out going the boost route.
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Old 08-27-2014, 09:52 AM   #20
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Quote:
Originally Posted by val916 View Post
What about the sct programmer are those any good?
those are among what the previous poster linked to you, and is the most commonly used tuner.
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Old 08-27-2014, 09:52 AM
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