87 300D MAF alternatives?

[skleutz]

I am curious to know if there is an alternative MAF sensor for the OM603 on a 87 300D. I have read elsewhere the flapper type sensor is very restrictive. It would certainly make sense to install a vane type sensor as this is a common upgrade on other diesel and gas engines. I have eliminated the air box and installed a K&N air filter directly to the MAF sensor. The noise is noticeable but certainly not extreme. I will take any benefit from making the intake or exhaust more free flowing as they are generally a relatively cheap way of increasing power and economy without sacrificing durability.