Sledguyry

I installed them vertically. They are working great. I believe the instructions call for them to be installed vertically. The connection on the stock bulb orientated vertically as well.

They were plug and play for me with no issues.

I would be very interested in this as well. Sick of my kids telling me my big truck has a wimpy horn. Lol. Sent from my iPhone using Tapatalk

I went with these for the high and low beams. Fahren H11/H9/H8 LED Headlight Bulbs, 60W 10000 Lumens Super Bright LED Headlights Conversion Kit 6500K Cool White IP68 Waterproof, Pack of 2 https://www.amazon.com/dp/B07NPMV1H5/ref=cm_sw_r_cp_api_glt_fabc_2YD2RG7XK4YRBZVMZRB0?_encoding=UTF8&psc=1 And these for the backup lights. Alla Lighting 912 921 LED Reverse Light Bulbs Extremely Super Bright 4014 30-SMD CANBUS 921 LED Bulbs RV T15 T10 906 W16W Back up, Cargo Lights Replacement, 6000K Xenon White https://www.amazon.com/dp/B072FHNZKW/ref=cm_sw_r_cp_api_glt_fabc_TRWF41QMYARNMZ38AC44?_encoding=UTF8&psc=1 So far no one has flashed me at night. Much better then the stock halogens. It was a pretty quick and easy install as well. Sent from my iPhone using Tapatalk

I have the kicker under seat sub and it was a huge improvement in my 2020 3500 LT. https://accessories.chevrolet.com/product/200-watt-subwoofer-and-200-watt-amp-kit-by-kicker-associated-accessories-19417165?year=2020&make=Chevrolet&model=Silverado%203500%20HD&modelId=6580&body=Crew%20Cab%20Pickup&bodyId=22&wheel=Standard%20Box&wheelId=349&trim=LT&trimId=430&drive=RWD&driveId=7&engine=6.6L%20V8%20DIESEL&engineId=17460&bodyNumDoors=5&categoryId=12319 I also went further and replaced all 4 door speakers with these JL Audio speakers: https://www.crutchfield.com/p_136C2650X/JL-Audio-C2-650X.html And for tweeters Memphis Audio: https://www.crutchfield.com/p_953PRX27/Memphis-Audio-PRX27.html I couldn’t be happier. Very nice bass from the kicker sub and great sound from the other 6 speakers. I haven’t switched out stock speakers on a vehicle since the late 90s and was very impressed with this combo. Sent from my iPhone using Tapatalk

I have the kicker under seat sub and it was a huge improvement in my 2020 3500 LT. https://accessories.chevrolet.com/product/200-watt-subwoofer-and-200-watt-amp-kit-by-kicker-associated-accessories-19417165?year=2020&make=Chevrolet&model=Silverado%203500%20HD&modelId=6580&body=Crew%20Cab%20Pickup&bodyId=22&wheel=Standard%20Box&wheelId=349&trim=LT&trimId=430&drive=RWD&driveId=7&engine=6.6L%20V8%20DIESEL&engineId=17460&bodyNumDoors=5&categoryId=12319 I also went further and replaced all 4 door speakers with these JL Audio speakers: https://www.crutchfield.com/p_136C2650X/JL-Audio-C2-650X.html And for tweeters Memphis Audio: https://www.crutchfield.com/p_953PRX27/Memphis-Audio-PRX27.html I couldn’t be happier. Very nice bass from the kicker sub and great sound from the other 6 speakers. I haven’t switched out stock speakers on a vehicle since the late 90s and was very impressed with this combo. Sent from my iPhone using Tapatalk

Thanks. This worked for me finally. The dealer wasn’t even sure how to do it. Lol.

What light bar do you have? I’m interested in doing the same setup. Sent from my iPhone using Tapatalk

What bulbs did you use? I’m interested in doing the same. Sent from my iPhone using Tapatalk

On my 2020 3500 LT HD I had the same issue and through trial and error noticed it was 100% caused by having the air recirculation turned on. As soon as I turn it off the whistling stops. I mentioned it to my dealer during my first oil change and the said they have never heard of this before. Sent from my iPhone using Tapatalk

That seems like a fair deal. Enjoy the new wheels! Sent from my iPhone using Tapatalk

In Minnesota 1 ton tabs are $120 a year. A 3/4 ton is 4-5 times that here. Easy decision for me. Sent from my iPhone using Tapatalk

It does not add any hp or torque but the added throttle response is night and day different on my duramax. Sent from my iPhone using Tapatalk

I installed the peddle commander on my 2020 3500 Duramax and wow what a difference. It really woke it up! No lag and crisp shifts through that 10 speed transmission. Sent from my iPhone using Tapatalk

I was thinking about going with these for the dash. https://www.memphiscaraudio.com/product-page/prx27 Sent from my iPhone using Tapatalk