How to rid of this super raspy ear piercing noise at cold start up

[Steve8989]

After its warmed up it starts up normal, but before that its horrible. What's an easy fix? Exhaust is Borla Atak full exhaust, catless.

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[Geodudes550]

Sounds like a bolt is loose somewhere

 

[Unbridled5.0]

A resonator? Different (actual) mufflers?

 

[jpjr501]

My car was actually louder than that. Long Tubes, no cats, MBRP mid pipe, MBRP race cat back. Horrible! Blew my garage pictures of the walls at cold start up.

Left the long tubes, no cats, stock resonator and stock cat back. Happy!
Gave away the MBRP crap.

Car still made 770HP at the wheels with the stock resonator and cat back. Exhaust gains are in the headers and cat area. After that, just noise which I couldn't take any longer.

 

[robvas]

Take the ATAK off

 

[Boosted Pony]

Ford likes to run negative ignition timing when cold to get the cats up to temp faster, once the cats are up to temp around 770 degrees the idle will go down and the intake and exhaust will quite down. When the car is warm the Ford programing does not go into negative ignition timing when you start it so it will be quieter when you start it.

While you have removed the cats in yours I think the cold start automatically does the negative ignition timing for about a minute or so no mater what.

 

[TonyT930]

Start with a stock resignator. And you are right. That start up sound isn't good.

 

[Massman]

Steve8989, I noticed your tail lights "pulsing". Is that something you did to the tail lights?

 

[JB60]

Steve8989, I noticed your tail lights "pulsing". Is that something you did to the tail lights?

That is mismatched frequency between the LED lights on/off rate and the video camera speed

 

[engineermike]

Op are you tuned? By who?

 

[GrabberBargeCaptain]

wow that might be the worst sounding coyote i've ever heard. please for the love of god get a resonator on there and put your cat back on.

 

[cerbomark]

That is mismatched frequency between the LED lights on/off rate and the video camera speed

Thank you for that, I always wondered.

 

[Free Spirit]

After its warmed up it starts up normal, but before that its horrible. What's an easy fix? Exhaust is Borla Atak full exhaust, catless.

Lose the ataks they sound about as shitty as a full straightpipe imo. Why would you want a raspy trumpet for an exhaust? Go pick up a nice 3in thermal r&d catback and you will have 0 drone, 0 rasp and a very deep aggressive sounding exhaust. I can get some clips if you want

 

[JB60]

Thank you for that, I always wondered.

I didn't know till Googled it ,the pulsing lights was asked about on FB Senior Mustang Group

 

[MidwayJ]

Loud aftermarket catbacks can sound good with the stock exhaust manifolds, but combining them with catless headers is too much.

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