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Thanks for doing this review and posting the videos. I already had the flapper valve propped open and the resonator screens covered on my 2019 Sierra 5.3L but I was looking for a little more sound and a deeper tone. Based on your posts, I ordered the AFE muffler and got it installed today. The sound is exactly what I had hoped for. My only concern was that I found a very slight harshness in the cabin at certain RPMs. It wasn't bad enough to even call a drone and I think I could have lived with it but for the heck of it, I removed the covering from the last resonator screen on each side. The result was a slightly quieter, but still deep, exhaust note and a much more pleasing in-cabin sound. Extremely pleased with this set-up.
I have the 5.3L/8 speed combo on a 2019 Sierra and I've had my Range device installed for about a week now and I'm pleased with it. I never really noticed the DFM doing it's thing until I propped open the exhaust flapper valve and covered the tailpipe resonator screens. I'm still planning on further modifying the exhaust but that's another discussion. The change in sound is what prompted me to try out the device but I do also notice slightly better throttle response. My commute is about 1/3 secondary roads and 2/3 highway and I've seen about 1 MPG loss overall. Others have mentioned some hard shifts when using the device but that hasn't been my experience at all.
To answer your original question, the light stays on because technically auto stop/start is still active. However, it will never engage because the range device tricks the ECM into thinking that there is a load on the engine. J
Has anyone successfully added a strobe module to their 2019? My understanding is that the bulb is LED but is in a sealed housing that must be accessed through the cab above the headliner. Maybe the module can be wired at the harness somewhere under the dash?
But what would be the point of that anyway? Instead of running for 15 minutes on one cycle, you'd only get 15 minutes plus something less than 30 seconds. Hardly worth the effort.
Actually, you can do it any time during the first remote start cycle and it adds 15 minutes from when you complete the sequence for the 2nd time. For instance, if you remote start and after 10 minutes of run time you press lock and then start it will add 15 minutes for a total of 25 minutes.
Your post just reminded me of a "feature" that I noticed the other day and it will save you 1 button press (16% increase in efficiency). You don't need to release the P brake with the button. Just put the truck in drive or reverse and the P brake will release as soon as you touch the accelerator.
https://www.wcvb.com/article/on-camera-truck-crushes-car-in-bizarre-car-wash-crash/30358388 This happened just a few towns away from me. I think that your floor mat would have to be pretty far out of place to allow this to happen. The truck doesn't even look all that damaged compared to the car.
I knew that tapping the buttons behind the left side of the steering wheel scrolls through your presets but if you press and hold, it tunes to the next available station. That's how it works for XM radio anyway. I haven't tried it for FM or other inputs.
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