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S197 Shelby Section This section is for technical discussions pertaining specifically to the latest installment of the Shelby Mustangs; the Shelby GT, the CS6, and the awesome GT500.

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Old 08-14-2008, 06:10 PM   #1
2cokeman
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Default Bullitt Mufflers on my GT500

I installed the 08-09 Bullitt mufflers today, they installed great and look great and line up almost perfect but they not really any louder, just a hair deeper than stock, I am wondering if they are less or more restrictive than the stock units because they are not made for the GT500 supercharged motor?
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Old 08-15-2008, 12:27 AM   #2
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the Bullitt mufflers are also on the GT500KR.... and it's noticeably louder than the GT500.....

do you have the H pipe?
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Old 08-15-2008, 06:39 AM   #3
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No, I have the stock xpipe but the KR mufflers have the Bullitt tips but the cans are round so they must be different internals?
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FRPP CAI with PROCAL Tune
X-Pipe with FR500S KR Mufflers
Steeda LCA's & UCA
Underrated at 540hp & 510tq
Carroll Shelby Signed Dash Plaque
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Old 08-15-2008, 12:30 PM   #4
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oh yeah, that's right.... that might be why
you might be able to ask your dealership about the difference in the Bullitt exhaust and the KR exhaust
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Old 08-17-2008, 05:24 PM   #5
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I was at the Shelby plant and a few KR's drove by. They are much louder than GT500's, so it must be the H-pipe vs X-pipe.
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Old 08-18-2008, 02:05 PM   #6
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put some Macs on it
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Old 08-18-2008, 05:16 PM   #7
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Ya, I am dissapointed!
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FRPP CAI with PROCAL Tune
X-Pipe with FR500S KR Mufflers
Steeda LCA's & UCA
Underrated at 540hp & 510tq
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Old 05-21-2014, 03:41 PM   #8
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The 08-09 Bullitt has a special (Bullitt Unique) designed H pipe with a restriction plate in the "H" cross over tube, for less exhaust pulse restriction, thus making the exhaust note both deeper & louder.
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Old 05-21-2014, 03:41 PM
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