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Old Oct 6, 2010 | 05:24 AM
  #1  
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Default Mid pipe question

I just purchased a megan axle back exhaust for my is350. I am not looking for any HP gains just a little sound.


Can someone explain to me what a mid pipe does? I did not buy one but I am wondering if I should.

Does it increase loudness?
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Old Oct 6, 2010 | 07:54 AM
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it will make it louder and gain 1-2 whp


so did you or did you not purchase the mid pipe?
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Old Oct 6, 2010 | 08:20 AM
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No I did not purchase the mid pipe.

All I bought was the axle back.

I guess I'll install it and see if I am satisfied with the loudness.
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Old Oct 6, 2010 | 02:57 PM
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Originally Posted by tarponman
Can someone explain to me what a mid pipe does? I did not buy one but I am wondering if I should.

Does it increase loudness?
The mid-pipe is the pipe after the catalytic converter and the right before the mufflers. Aftermarket mid-pipe's focus on relieving back pressure from the engine, and a mid-pipe will make your car louder. I have the Joe Z full catback and it is, in my opinion, considerably louder than stock but this replaces everything from the headers back compared to axle backs.
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Old Oct 6, 2010 | 10:23 PM
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It makes your exhaust louder, particularly in the midrange when an axle-back exhaust generally tapers off. Here are some sound clips: https://www.clublexus.com/forums/per...a-midpipe.html

The downside is considerably more drone at highway speeds, and it's illegal in some states like California.
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Old Oct 7, 2010 | 08:32 AM
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Originally Posted by brociouz
It makes your exhaust louder, particularly in the midrange when an axle-back exhaust generally tapers off. Here are some sound clips: https://www.clublexus.com/forums/per...a-midpipe.html

The downside is considerably more drone at highway speeds, and it's illegal in some states like California.
It's illegal in all 50 states actually since it's a federal law you are violating.

It's just that some states don't do inspections where they check it.
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Old Oct 7, 2010 | 10:44 AM
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Originally Posted by Kurtz
It's illegal in all 50 states actually since it's a federal law you are violating.

It's just that some states don't do inspections where they check it.
Is that the law where it says you can't remove ANY working catalytic converter? Even if you're replacing it with a different one (as in the case with Megan midpipes)?
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Old Oct 7, 2010 | 12:08 PM
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I believe so. You are not allowed to modify or replace a working Cat. I remember reading this on Turbo Magazine.

But if it was somehow damaged by a parking curb or roadkill, then you are allowed to replace it.
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Old Oct 7, 2010 | 12:14 PM
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^ Yeah, come to think of it I'm pretty sure a rat chewed through my OEM midpipe so I just HAD to get the Invidia. I'm so screwed when I have to go in for a smog check LOL.
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Old Oct 7, 2010 | 12:14 PM
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Originally Posted by shadowman
I believe so. You are not allowed to modify or replace a working Cat. I remember reading this on Turbo Magazine.

But if it was somehow damaged by a parking curb or roadkill, then you are allowed to replace it.
Yup. But even if it were damaged you'd have to (legally) replace it with another working cat, not a midpipe.
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