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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

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Old 04-27-2003, 02:26 PM   #1
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legal exhaust limit

hey been looking around for this law but can't seem to find it... how much pipe do i HAVE to run out of my cat to be street legal? i've heard 19-22inches but not sure... any ideas? (bobbing my bed and have to cut some, why not cut it all?!)
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Old 04-27-2003, 06:42 PM   #2
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I would think that every state is different. That would not be something that is federally regulated. Check with your local DVM.
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Old 04-27-2003, 07:05 PM   #3
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I've heard that it has to be even with the end of the body. Having the pipes terminate under the body seriously increases the chances of CO poisoning.
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Old 04-27-2003, 07:27 PM   #4
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Arrow I think it's like this

I think it's like this: have as little pipe as you can, but it has to be under 95 dB's. I know it has to be under 95 dB's for a fact to be street legal. Not sure if it's at a certain RPM--3000 sounds familiar but I can't say for sure. Most aftermarket exhausts try to reach the perfect median--as little pipe as possible for best air flow but all while staying under 95 dB's. Think about it -- NASCAR cars are loud as all hell, and they have no mufflers, cat.'s, and a lot of the exhaust is non-existant. Their HP is damn good though. It's tough to accomplish high-flowing exhausts while still keeping quiet, so as a GENERAL rule (not always true), the louder the exhaust the more HP. I don't think it's based on the length of the pipe though.

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Old 04-27-2003, 07:27 PM
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