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[bmwman91]

All AFMs will have an inherent acoustical / mechanical resonance, or multiple. But, as you mention, it is more of an issue with a 4 cylinder since there is little to no intake overlap. The MAF signal...

[bmwman91]

Is the issue related to vehicle speed, or engine RPM?

If it is RPM-related:
Change the fuel filter and maybe see about getting the injectors cleaned.

Is the original catalytic...

[bmwman91]

I developed a custom MAF conversion for my M42 a number of years ago and have been running on it ever since (stock engine and a 2.1L stroker). Compared to the stock AFM, there really is no performance...

[bmwman91]

Sold!

[bmwman91]

I was able to get a local BMW dealer to provide the original security code for this radio. Big thanks to Stevens Creek BMW's service department for the help! I had to physically drive in to get the assistance,...

[bmwman91]

Aah, so that was yours on there. These radios sure are worth a heck of a lot more than they used to be. I'd have to list this at nearly $500 on there to get the same return I am getting on here with it...