Exhaust sound at 2k crusing with headers

[Flyhalf]

I know it is a stupid question.
Setup
Lht headers. Borla atak3 e85 2018 mustang

i never really cruise with the car (it is a racecar) .
I'm doing some dyno these days and cruising on highway after installing Headers creates..i dont know how to explain.. Like an helicopter exhaust sound. Like if i can hear combustion on the cylinders.almost knocking.
I think is because only a small amount of throttle is used and way more sound produced by the HEADERS.
. Enfact when accelerating the helicopter sound type is gone and a continuous exhaust noise is in place.
I just want to be sure I'm not fucking up by engine before NATIONALS IN 2 WEEKS. please share some thoughts.

I just want to be sure is ok
Thanks.
Alex

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[Flyhalf]

THE METAL CRACKING IS THE CAGE.
Try to fovus on engine noise
Hard to record

 

[NGOT8R]

I hear it. Are you sure the headers aren’t hitting the little bolt on the AC line on the passenger side, or the mid pipe isn‘t making contact with the floorboard? Are the knock sensors picking up anything?

 

[Flyhalf]

I hear it. Are you sure the headers aren’t hitting the little bolt on the AC line on the passenger side, or the mid pipe isn‘t making contact with the floorboard? Are the knock sensors picking up anything?

Oh ok the metal rattle is the cage.
And no AC anyway. Is not the metal cracking noise. Is the engine noise. Again I think is normal.but u never know.

 

[NGOT8R]

Here’s a video from mine. It’s hard to tell in your video, but does it sound similar to this?

 

[Flyhalf]

Here’s a video from mine. It’s hard to tell in your video, but does it sound similar to this?

Actually yes. So i guess is normal

 

[NGOT8R]

Actually yes. So i guess is normal

Yep, that’s normal. On my car, it has either disappeared or I’ve gotten used to it and don’t notice it anymore.

 

[Jackson1320]

It’s normal. I have tried 3 different headers and catbacks and always there

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