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Stock or not stock exhaust?

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Old 06-11-2014, 08:45 AM   #11
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There are GT500 FRPP mufflers, too, which are similar to Borla Touring. If you're have 4" slash cut single wall tips they are likely the stock GT500 muffler, which is a sweet piece as it is quieter than others and has a mellow tone. When you're better, have a look under the car and see if someone changed out the H for an off-road, as that'll dramatically increase volume, no matter what's out back.

Here's a thread with pics:

Last edited by P51C; 06-11-2014 at 08:47 AM.
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Old 06-13-2014, 11:39 PM   #12
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P51c - they seem to be the standard 500 GT mufflers. I thank you for that thread with pics.
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Old 06-14-2014, 04:43 AM   #13
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talking about gt500 mufflers, are those technically legal in the 5.0 Mustang? I am not saying emissions but noise levels. I wonder what the Decibel difference is. I have Roush Axle backs and those things are loud when the engine is cold.
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Old 06-14-2014, 02:13 PM   #14
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We have harleys and crotch rockets flying past our house constantly that are 10x louder than my Mustang with Magnaflow Competition exhaust.
'11 GT Brembo/3.73 Steeda Intake, Magnaflow Competition, Hypermotive tune
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Old 06-29-2014, 09:50 AM   #15
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If it's that loud, it's not a stock exhaust. Simple.
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