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I'm only finding old threads that discuss the matter, are they safe to use and worthwhile? Does a less restrictive exhaust actually help that much?
 

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2009 SRX V6 RWD, 2011 CTS Premium Coupe
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Depends on how you define "less restrictive exhaust." Catbacks are typically said to provide 10-15 hp, which was my experience with my GXP. Headers should make a far more dramatic difference. I have no experience with that 2.8, so I've no idea if such a thing exists.
 
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