Crap

Look elsewhere. This coming from a guy who put a resistor from eBay in his MAF connector and made a home depot intake with eBay cone filter back in college to gain "herspewers"....

If you have specific goals, feel free to post year/make/model/engine info and your goals, and I'm sure the board would be willing to offer advice.

halibut sinclair said:

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Are these good or crap?

https://chipyourcar.com/

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If car manufacturers could add 4-6 mpg for <$150 of incremental cost, they'd do that in a heart beat. That should tell you the device is a scam.

Don't forget to install those fuel-line magnets to get all those molecules properly aligned. And while you're at it, those throttle body vortex spacers will use patent pending technology to get that intake air spinning and increase the kinetic energy of that air.