HHR SS Topics and information on the 2008-2010 Chevy HHR SS Turbocharged models.

Best exhaust upgrades for your buck ?

Old 06-30-2016, 07:37 PM
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Originally Posted by drummerboy0088
You mean this one? https://www.ebay.com/itm/331071807563

It's labeled as a 2.2/2.4 high flow - maybe because the SS already has a 2.5" high flow exhaust from the factory? If you're upgrading SS exhaust might as well go 3" so it breathes better.
Yes, the HHR SS has a very high flowing system...
The 2nd cat is the only restriction, which is easily fixed by 'coring' the 2nd cat.

When your 'pushing' 350hp, you can go to a 3' cat-back & you will only gain a tenth in the quarter mile.
I went from 12.4s to 12.3s by going to a 3' cat-back.
The stock HHR SS free-flowing 2.5" system is so awesome, & if I knew that I would only gain a tenth, I wouldn't have changed it...
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