Originally Posted by 1of40
Located mine behind the passenger side headlight. Seems like a decent spot for cooler air. In full disclosure, I don't have many miles on this app yet but so far so good.
I think your air cleaner might be too small and restrict your air flow.
The stock 200/300TDI air cleaner is pretty good size, but yours appears to be much smaller.
I initially used a large cone K&N filter on my Mercedes 5 cylinder diesel but it made a strange sound at higher rpms.
When I calculated the outside dimensions of the K&N air filter for the stock Mercedes air cleaner I found that my cone filter only had about 75% of the surface area of the stock one. This seemed to be a reasonable approach to getting the right surface area for a K&N filter because they are very coy about the CFM figures for each filter even though they go on a length about all their testing and measurements.
Here is a K&N air filter for a 1995 200/300TDI: http://www.knfilters.com/search/product.aspx?prod=E-2590
. I calculated the outside surface to be about 182 square inches (11.313" x 3.141592 x 5.125")
Then I went to this page to find a suitable cone or cylindrical filter: http://www.knfilters.com/search/universal.aspx.
It took me a while using this calculator and the measurements for the area I had available to install it, but I found a quite large cylindrical filter that is about the same surface area as stock. However, the Mercedes 5 cylinder diesel only needs about 150 square inches so yours would have to be even bigger, but I'm quite sure that your existing one is much smaller than my original cone filter..