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Old 04-12-2011, 11:48 AM   #21
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I have a 3" Enthuza, removed the cat, and it went about .3 leaner across the board...so it's moving more air now. I'm not sure if it was worth it or not.
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Old 04-12-2011, 12:12 PM   #22
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I have an artech 3 inch, just 3 inches all the way to the muffler, (Magnaflow) and it is a little louder than my obx dual exit with resonated test pipe. You don't really notice til the wastegate opens up. I never have ran a cat in my car, but... if it is like the difference from going to 2.5 inches to 3 inches then yes, it matters alot.
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Old 04-12-2011, 12:39 PM   #23
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its worth it to go catless. less restriction is better. you can always swap it out if you need to.
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Old 04-12-2011, 01:19 PM   #24
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I'm running a test pipe with my FM 2.5" non-resonated system, so the only restriction between the turbo and the bumper is a single muffler, and it is not loud AT ALL. Top down while driving, the intake noise is louder than the exhaust, and I only really hear it when going through underpasses. It would be a different story if it were NA, since the turbo quiets things way down.

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