Can I use a universal catalytic converter replacement

2017 MAZDA 3
30,000 MILES • 1.6L • 4 CYL • 2WD • AUTOMATIC
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FADU
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I hollowed my catalytic converter (for pops tune) and i didn’t like the sound, it had a metallic sound inside the car when i but gas.
Can i but universal cat to fix it as it was stock?
As the original one are really expensive.
Apr 12, 2022 at 4:16 PM
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SQM
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Hello,

On these newer vehicles, for the most part those universal converters do not work properly and will likely trigger the check engine light. Also, might not pass emission.

https://www.2carpros.com/articles/catalytic-converter-replacement

Please let me know of any questions.
Thank you.
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Apr 12, 2022 at 11:16 PM
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FADU
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The wu-twc is hollowed and twc is removed in my car
How can i fix the wu-twc for the metallic sound! (which is expensive)
Should i put twc again or no difference?

A mechanic suggested to open wu-twc and put a pipe in it and fibers he said it will fix it. is it true?
Apr 13, 2022 at 4:57 AM
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SQM
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Do you happen to have an example of the metallic sound you are looking for? Was this on a certain car with certain exhaust?
Because exhaust is typically tuned and manufactured in certain way to produce specific sounds.

As for the putting a pipe and fiber in the converter, I'm not sure that will do what you are looking to achieve.
Apr 13, 2022 at 9:03 AM