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Straight pipes

Hello, I got these custom straight pipes which delete the mufflers and it gets extremely loud above about 4k rpm to the point i hear parts of the car vibrating.

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Old 04-20-2014, 10:49 AM   #1 (permalink)
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Default Straight pipes

Hello,

I got these custom straight pipes which delete the mufflers and it gets extremely loud above about 4k rpm to the point i hear parts of the car vibrating.
I'm running stock cats and everything else.

I was wondering if this is normal or might damage something from the extreme vibrations. Also do these straight pipes increase back pressure and reduce torque or hp somehow?


Thanks,
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Old 04-20-2014, 11:48 AM   #2 (permalink)
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Lol no you'll be fine. And they wouldn't increase pressure, they'd decrease it. Back pressure is kind of a myth. Exhausts have more to do with scavenging and a muffler delete will not help nor hurt it.
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Old 04-20-2014, 11:53 AM   #3 (permalink)
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Lol whoops I meant decrease back pressure, but does that vibration thing happen to all cbe with loud noise or is it just my ghetto thing? Cause I'm thinking of getting a cbe or top speed axle back but if it's the same thing might as well keep mine.

Thanks for the help


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Old 04-20-2014, 01:32 PM   #4 (permalink)
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Just a nissan thing. It's just a cheap Japanese car spot welded together. Things rattle. A CBE will have a bigger/better mid pipe and X or Y or H pipe. Sound and rattle won't change much unless you buy a reall quite CBE.
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Old 04-20-2014, 01:54 PM   #5 (permalink)
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Originally Posted by synolimit View Post
Just a nissan thing. It's just a cheap Japanese car spot welded together. Things rattle. A CBE will have a bigger/better mid pipe and X or Y or H pipe. Sound and rattle won't change much unless you buy a reall quite CBE.
So basically the louder it is the more rattle it'll have for the most part?

Mine does have lots of vibrations from the inside which i thought was not normal since its my first car mod, but now i know its normal

Thanks a lot man !
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Old 04-20-2014, 03:01 PM   #6 (permalink)
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Back pressure is kind of a myth.
Not exactly. Too much flow when the engine isn't drawing in enough air /or there is too much valve timing (typically, at lower RPMS) to match the exhaust will slow down the exhaust pulses.

But anyway, yeah, the VQ37HR sounds like a tractor without cleverly placed resonators.

You can add resonators strategically to minimize the noise -- there's a thread on this floating around.
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Old 04-20-2014, 06:14 PM   #7 (permalink)
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So basically the louder it is the more rattle it'll have for the most part?

Mine does have lots of vibrations from the inside which i thought was not normal since its my first car mod, but now i know its normal

Thanks a lot man !
Not really. A loud cbe can still have good flow. Loud and crapy flow with have rasp, drone, vibrate etc.
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Old 04-21-2014, 12:37 AM   #8 (permalink)
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I see, thanks !


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