1969-70 Boss 429 Mustang: Windshield Production Card

1969-70 Boss 429 Mustang: Windshield Production Card

Marsoni

M251S

$15.00

Get it in 3 business days with 1 day shipping. Friday, May 29

1969-70 Boss 429 Mustang: Windshield Production CardThis Kar Kraft windshield card was used to numerically identify each car as it was converted on their assembly line. Card is taped to the inside windshield on the passenger side. (Vehicle owner MUST provide Nascar KK number when ordering) Application: 1969 70: Boss 429 Mustangs

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Seemed to work as well as or better than some more expensive catalytic converter cleaners. I put it in while at 1/3 tank and my Check Engine light went out almost immediately once I started driving. My Tundra has almost 230,000 miles and still runs great but was getting a little harder to start after I switched from full synthetic oil to conventional. I’ll never do that again and immediately switched back but the damage was done. Check engine light came on and I had to crank longer to get it started. Adding this Liquid Moly fixed both issues temporarily. I have to wonder if this was used regularly, say every 3 months, if it would clean the catalytic converter more permanently?

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Reviewed in the United States on December 29, 2025

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Jon.

Charlottesville, US

★★★★★ 3

Ehh??

Didn't work for my on my 17 hyundai accent with 90k on it. I poured the whole bottle in with a half tank of gas. And went for a 3 day italian tune up.... no dice.

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Reviewed in the United States on May 8, 2026

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Juan Gonzalez

Louisville, US

★★★★★ 5

Works great

Follow instructions and it will work. Had a p420 code, caught it early used this. No more code and passed emissions

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Reviewed in the United States on May 10, 2026

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Matt Teed

Louisville, US

★★★★★ 5

Actually works on BMW!

I purchased this after the shorter black fluted tool I bought last year failed me. This thing is way better constructed, fits perfect , and actually works to turn it after you can’t turn it by hand any further. Was able to get torqued down to 25nm no problem finally with ease!

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Reviewed in the United States on November 12, 2024

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Dak

Houston, US

★★★★★ 5

Works great

Works great

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Reviewed in the United States on May 26, 2025