Burbles + Pops on Decel, Stock Car, Worrying?

[Metz302]

Hey everyone. I have a 2017 Mustang GT that is otherwise stock besides Exhaust and Suspension parts.

Anyways I noticed more recently my roush catback (mufflers with an h pipe) have been burbling, and makes pops sometimes under decel, it is more prevalent when it’s cold (the car.)

My AFR is always between 13.8-14.8 depending, so I don’t think it’s running rich where it’s dumping fuel into the exhaust? I’m starting to worry even though it sounds cool.

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[Pittpa]

IIRC, when my 2019 engine was cold and I let off the gas, the mix stayed around 14 and I got burbles with stock exhaust. When warm, letting off gas, it went to 20 and no burbles.

 

[Eyesac]

Both coyotes I've owned have made more burbly decel noise as they got older. Both had almost no burble on stock exh, after an H-pipe/X-pipe they burbled. Maybe a Cat thing, maybe a break-in thing, who knows... I wouldn't sweat it, I think it's neat lol

 

[Metz302]

Both coyotes I've owned have made more burbly decel noise as they got older. Both had almost no burble on stock exh, after an H-pipe/X-pipe they burbled. Maybe a Cat thing, maybe a break-in thing, who knows... I wouldn't sweat it, I think it's neat lol

Oh yeah it sounds cool.

I love the way it sounds but it never did it before. lol

 

[Zrussian13]

My car isn't stock but always pops more when its cold or wet.

 

[GrabberBargeCaptain]

On my '23 I get a lot of pftpftpftpft, even stock I did, it's a bit louder with the Borla S Type.

On hard acceleration between shifts sometimes I get a pop but it's not every time.

It hasn't changed in the 13k miles i've put on the car

 

[Metz302]

On my '23 I get a lot of pftpftpftpft, even stock I did, it's a bit louder with the Borla S Type.

On hard acceleration between shifts sometimes I get a pop but it's not every time.

It hasn't changed in the 13k miles i've put on the car

Okay awesome! I’m just surprised. I’ve had this roush h pipe and axle backs on for like two years and it just became more noticeable. Sounds so good

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