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Hpipe Xpipe difference

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Old Jan 10, 2013 | 11:02 PM
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Originally Posted by Mike's LS3
So GM changed over from the H pipe to X pipe in 2008. As I stated earlier, my 2008 oem NPP has an X pipe.
That is correct..
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Old Jan 11, 2013 | 12:56 AM
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why did they go with 2 more cats on the 2013??
..my guess would be the same as an 01 z, they had 4 cats..and the reason then..was smog reg's...run cleaner..worried the car would'nt pass CA reg's...
maybe some other reason like enviornmental reg's put on GM by the govt.maybe getting ready for the 2014 engine...??
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Old Jan 11, 2013 | 08:34 AM
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Originally Posted by haljensen
No, it would be a dual exhaust with no crossover.
BINGO........
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Old Jan 11, 2013 | 11:42 AM
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Originally Posted by bud miller
i think there is a little more popping on decel with the x pipe..could be just me , cause i have z06 exhaust on my ls3..
That is true,and i like it.
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