zzp catted dn pipe?? - Chevy HHR Network


2.0L Performance Tech 260hp (235hp auto) Turbocharged SS tuner version. 260 lb-ft of torque

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Old 07-04-2017, 07:47 PM   #1
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zzp catted dn pipe??

what kind of power difference with a can one expect from a zzp catted dn pipe on a 09 hhr ss? the car is stock otherwise. zzp doesn't claim any power numbers.
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Old 07-04-2017, 08:24 PM   #2
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Originally Posted by gds1998 View Post
what kind of power difference with a can one expect from a zzp catted dn pipe on a 09 hhr ss? the car is stock otherwise. zzp doesn't claim any power numbers.
Don't have any info on that, but Dave(2005HHRauto) has done a lot of testing with different DP configurations. Here's his thread https://www.chevyhhr.net/forums/hhr-...t-power-43170/
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Old 07-05-2017, 08:04 PM   #3
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If you are doing it as a stand alone mode, i doubt you will feel any power difference. I think it is more of a supporting mode, if you are getting tuned or going bigger turbo.
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Old 07-14-2017, 11:07 PM   #4
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None - the stock tune in the SS has a learn down feature. You would need to go to some aftermarket tune to defeat that feature. Even GM's own upgrade defeats it.
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Old 07-15-2017, 12:20 PM   #5
 
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You probably won't see much unless you do some major mods that increase exhaust flow.
Otherwise I would assume you would lose some low end power and gain a little top end if it's even noticeable.
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