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Cat back.

GAMark

By GAMark
in 6.6L Gas V8 (L8T)

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GAMark Enthusiast

GAMark

Posted
Posted (edited)

Has anyone found a Cat Back Exhaust that does not drone when towing?

Edited by GAMark
KARNUT Senior Enthusiast

KARNUT

Posted
Posted
14 minutes ago, GAMark said:

Has anyone found a Cat Back Exhaust that does not drone when towing?

I was fortunate enough for many years to know a custom exhaust bender. When cross over exhaust became a thing is when drone showed up. Uneven exhaust sounds the best in my opinion. They have all kinds of tricks now to eliminate drone. I saw a demonstration where max HP was achieved with single exhaust. Most modern factory exhaust flows to achieve max rated horsepower without intake modifications or additional tuning. The last exhaust I did I simply changed the muffler leaving the resonator to increase sound without drone. My last performance truck I did true duals without the cross over, loud no drone. If you go with most any modern cat back. It will sing while pulling. There’s loud than there’s drone. One sounds good the other doesn’t. If you have access to an exhaust shop I’d start with a different muffler, just the muffler. You could spend a fortune to eliminate drone. 

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OS RR Enthusiast

OS RR

Posted
Posted (edited)

My understanding is a properly setup "J pipe" will eliminate the resonate'n but, I don't understand the math to it.

 

Also more accurately known as a Helmholtz resonator.

Edited by OS RR
  • Like 1
CamGTP Senior Enthusiast

CamGTP

Posted
Posted

I have a dynomax cat-back on my truck, been on it for probably 7 years now. You can barely hear it on the freeway and when I tow my 20ft car trailer. This is on a 2016 Silverado though, newer trucks to me are quieter on the inside compared to mine.

Byrds8 Enthusiast

Byrds8

Posted
Posted
4 hours ago, OS RR said:

My understanding is a properly setup "J pipe" will eliminate the resonate'n but, I don't understand the math to it.

 

Also more accurately known as a Helmholtz resonator.

I believe the J-pipe causes a 180 degree phase shift in the frequency that causes drone. Doing so cancels out the sound.

  • 2 weeks later...
dal1980 Enthusiast

dal1980

Posted
Posted

I installed a Borla S Type on my 24.  I love it and have no drone, at highway speeds cruising you can barely hear it.  

  • Like 1

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