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How restrictive is the stock mufflers?

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Old 03-28-14, 11:13 AM
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idoke1
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Default How restrictive is the stock mufflers?
As the title states. I'm curious to see how restrictive the stock mufflers are for the 2nd gen IS. Any inputs would definitely help.
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Old 04-02-14, 10:34 AM
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Well, a couple days later and I guess no one knows. I found a diagram and it seems ok.
Attached Thumbnails How restrictive is the stock mufflers?-is350_exhaust1.jpg  
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Old 04-02-14, 12:37 PM
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^I never knew our mufflers had a control valve like that built into them. Thanks for posting that!
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