https://youtu.be/_hREmy9mEvs
https://youtu.be/JGBe5OQg410
https://grassrootsmotorsports.com/ar...nverter-face-/
They gained one or two horsepower in specific parts of the power band, while the rest was the same or a tiny bit lower.
If I decided to get rid of my car I would recycle it and install a straight pipe.
Turning precious metals into a mess confuses me.