Exhaust Pipe

Tuktuk · February 21, 2022

Good Day everyone,

hope you guys have an amazing day.

Quick question here guys, specially to all GMC sierra 1500 denali 2021 users. I just noticed it yesterday. Idk if its normal or not.

i started my truck yesterday in a cold weather and i noticed only ONE EXHAUST PIPE is working.

is that normal to all 2021 denali or not?

I got Stock exhaust still.

CamGTP · February 22, 2022

Path of least resistance is likely the case here. You'll see this a lot on factory dual exhaust cars and SUV's too. The y-pipe section isn't exactly equal and the exhausts gases are going to go on whatever path is fastest.

If you revved the engine you'd get some from both sides.

Tuktuk · February 23, 2022

19 hours ago, CamGTP said:

Path of least resistance is likely the case here. You'll see this a lot on factory dual exhaust cars and SUV's too. The y-pipe section isn't exactly equal and the exhausts gases are going to go on whatever path is fastest.

If you revved the engine you'd get some from both sides.

So thats normal sir? Thats wierd.

Hope its not a bad thing, LOL

CamGTP · February 23, 2022

Yes, it's normal.

Harreldt · February 26, 2022

Noticed the same on my Borla exhaust yesterday. I reved the engine and still no exhaust from 1 side. Vehicle runs fine. Shop had a look in the parking lot and couldn’t figure it out. Scheduled to put it on a lift Monday for a closer look. I’ll let you know what we find out

Tuktuk · February 28, 2022

On 2/26/2022 at 8:13 AM, Harreldt said:

Noticed the same on my Borla exhaust yesterday. I reved the engine and still no exhaust from 1 side. Vehicle runs fine. Shop had a look in the parking lot and couldn’t figure it out. Scheduled to put it on a lift Monday for a closer look. I’ll let you know what we find out

Thank you sir,

Just noticed mine week ago.
My diagnostic was saying its fine. But still couldnt get it off my head,

Pls let me know, would really appreciate it.

KARNUT · February 28, 2022

Very few vehicles if any have true duals these days. Like was already said path of least resistance. I’d do remember though even when I had true duals back in the day more steam out one side at times.