How do I remove the sweat smell from my leather car seats?

I was thinking about installing a turbocharger in my Ford, but I've never purchased any car modifications before. How much does a Ford F150 turbo kit typically cost?

Driving home last night, I came across some debris in the road—it was a combination of stuff, like boxes and wooden boards. By the time I noticed it, it was too late to do much, so I ended up driving over some of it, which I later discovered scraped up a lot of the undercarriage on my 2020 Lexus GS 350—including the catalytic converter. How much does it cost to replace a Lexus GS 350 catalytic converter?

I just installed a new sound system in my car and now my front passenger speaker has poor sound output. I think the speaker might be bad, but before I return it, my friend told me to test the polarity. How do I test a car speaker wire polarity with a multimeter?