2019-2022 exhaust sounds/DFM

[HuskeyBoy]

Hey guys, I’ve been reading this forum for years and stealing good info .  Thanks! I just bought a 2020 Trail Boss with the 5.3 I want to put a Borla Atak muffler on it to make it sound good.  The old AFM trucks would sound terrible sometimes when they dropped to less cylinders, how is the sound on the new DFM engines when it scales back on cylinder usage?  Do you get that helicopter “brap-brap” sound?  I’ve tried to find YouTube videos in the newer trucks but no luck yet or I’m not searching right.

 

Thanks y’all!

[brewtus]

You don't need to, but most likely will want a Range LT Pulsar to disable the DFM.  That is currently what is holding me off on upgrading exhaust.  I can definitely hear the DFM and feel very slight engine vibration when it activates on highway and smooth roads with stock exhaust.  Will definitely be amplified by aftermarket exhaust.  Go search youtube for videos, there are quite a few out there doing before/after comparisons with DFM active and not with aftermarket exhasust - Donslife and LMFScrew.

[HuskeyBoy]

Hey man, thanks for the reply.  They don’t make a Range for the 10-speeds yet or I’d get one.

[brewtus]

Right, it's the Pulsar LT from Range.  I would have gotten one too if you didn't need to buy the Pulsar for $500 - all I need is the DFM deactivation since mine wasn't built with auto start/stop.  Hard to justify the cost for just that.  What's ironic is that for '22 models not build with DFM you get a $50 credit from GM.  Heck, I would have PAID $50 to have it disabled!!!

[J2Jones]

I have a 2019 with 6.2L and 10-speed with a Borla S-Type. There is no drone and no helicopter sound on the highway.  I have DFM active while you may be able to hear the change slightly, I think you'd really have to listen for it.  IMO, with this combination, the "need" for DFM deactivation is oversold.

[jaxcam02]

One option you could try is to get your exhaust shop to weld in the flapper valve from your stock pipe.