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[Vincenze]

There are 3D-printed covers for different tweeters.

Here is one for your Alpines, but they are made in China, not the USA.
I don't see pins to hold it in the body.
https://ww...

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This guy used Italian speakers, but he also installed a subwoofer.

https://www.r3vlimited.com/board/for...ojects-1992-co...

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If your system works sometimes, but then produces hissing sounds, then the main problem should be with the head unit made by Alpine.
It has moving parts that are old and oxidized.

It's...

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The E30 sound is a two-way system: a tweeter and a woofer.
The red wire around the woofer plus a capacitor is a crossover to split high frequencies that go to the tweeter and low frequencies that...

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Bosch Motronic numbers increase with each new release of software and hardware.
The 173 and 524/525 are Motronic 1.3 for M20. The 525 should be a 1991 software release.

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My 1991 325i came with the 524.
Later cars came with the 525. I believe Bosch made them until 2015.

There should be no electrical differences between the i and iX versions of the M20....

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I saw newer production 524 and 525 DMEs from Bosch, they may have hardware fixes, but the 525 should be the latest software release for the M20....

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You can buy a new aftermarket one inexpensively.

I saw Delphi on Amazon for $60.

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In Germany, you can buy a brand new Bosch DME for $350. That's what Programa wants.

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Check Programa's listings on eBay.
$350.

You can find cheap DMEs everywhere.
For some reason, people don't want the 524 and 525, which were the latest versions.

$80...

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You can verify a speedometer by connecting it to +12V and Ground.

The speed input must be connected to Ground intermittently; the higher the frequency, the higher the speed.
A p-mosfet...

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He has a website to check details about available cars.
He dismantled only 1 E30 in 2025.

But there are many cars with 6-speed transmissions.

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Don't you have to disconnect one of the big water hoses in front of the engine anyway when you start filling in new coolant through that hose?
BMW coolant is blue-green.

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Replacement floor pans are available.

Check videos from this body guy.

https://www.youtube.com/watch?v=d2r1LfxY61M...

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The AC retrofit kit is available for the M3 too.
And it's not extremely expensive compared to what he paid for the car.

I guess even finding a good original ac compressor isn't very...

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He bought the car in January and he is selling it two months later.
I guess it's not a good car for daily driving....

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The rubber joint is available new 32311153993.