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Just4Derek,Oct 10 2006, 10:29 AM Wrote:I am thinking modifying the exhaust system. But I heard if just change the exhaust without the new header and flex pipe. All you get is just louder sound.

In order to gain HP, you need to change header and flex pipe too.

Right?
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You'll gain more ponies with a cat back. You'll gain even more if you open the rest of the system to match your cat back system.

But Like NOS said, and really with any car going for power the Naturally Aspirated way, you get more noise.