Exhaust- Sounds awesome now, deleted muffler, cut 36" off, but dro

PaulM · January 8, 2014

So I modded my exhaust. I cut 36" off the end, up in front of the resonator, then cut the muffler out and put a straight pipe in place. Now it honestly sounds bada$$. Only problem is, I get that drone still from V4 to V8, AND right between 1500rpm-1800rpm. My question is, what is the best solution for this? The plug in device to kill AFM? A tune to kill AFM? Or a free flowing exhaust (straight through) such as Borla or Corsa DB and install that muffler? I wonder if extending the exhaust back to the side exit at the stock position would change anything because now it dumps right above the axle under the bed.

Dj0nes · January 8, 2014

Do a search. A lot of info on this subject.

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PaulM · January 8, 2014

Do a search. A lot of info on this subject.

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Someone else has cut 36" off, dumped under the bed and deleted the muffler too and has drone? My search didnt show a result for this, could you point me too it please?

PaulM · January 8, 2014

Going to try this:

http://www.performancetrucks.net/forums/gm-engine-exhaust-performance-21/exhaust-drone-fix-424169/

tainoxl · June 13, 2016

You can do a j-pipe to cancel resonance or drive in M5 will keep afm from coming on. I am getting the MagnaFlow muffler from my catback replaced with a y pipe, it's just to quiet for me.

Zachlovesfood · June 14, 2016

Some people put the flapper valve back on to accommodate for V4... I had it disabled via Diablo Tuner. I installed 3" stainless tubing, a Magnaflow, and dumped it downwards right before the axle.

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Zachlovesfood · June 14, 2016

Forgot to add.... No drone whatsoever. Even with the Kooks headers.

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thearizonacowboy · June 14, 2016

Forgot to add.... No drone whatsoever. Even with the Kooks headers.

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Andddd there's my inspiration for this weekends fun lol thanks!

Zachlovesfood · June 14, 2016

Andddd there's my inspiration for this weekends fun lol thanks!

Glad to help!

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BigBlueLB756 · June 22, 2016

Here's a couple of Helmholtz closed-end chambers installed in trucks to kill the drone in the 1800-2000 rpm range in top gear. Also works well with 4-cylinder "racket">

Some chamber length calculations for your enjoyment:

It doesn't care which brand of muffler it's hooked up to.

Zachlovesfood · June 24, 2016

Here's a couple of Helmholtz closed-end chambers installed in trucks to kill the drone in the 1800-2000 rpm range in top gear. Also works well with 4-cylinder "racket">

Some chamber length calculations for your enjoyment:

It doesn't care which brand of muffler it's hooked up to.

Is that just a branched off pipe, closed at the end? Curious to know what all exactly is going on here! Thanks

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BigBlueLB756 · June 24, 2016

In essence, it's a reflexive chamber, tapped into the tailpipe and capped off at the outer end, that reflects back the offending resonance into the exhaust flow 180 degrees out of phase, effectively cancelling it out. Here's some reference threads for your summer reading:

http://www.camaro5.com/forums/showthread.php?t=102075&highlight=drone

http://www.g8board.com/forums/116-exhaust-tech/16077-almost-drone-free.html

I was BigRed585Lbs in those threads. This "science" works.