For those with the M113 engined c43 or 55 you should all be interested. I got my hands on a bigger air-box which arrived here a couple of days ago. This should definitely improve airflow to the engine in comparison to the OE box which is rather restricted and it is not priced at silly money levels. The air-box will be installed in the next days and I'll be getting my w202 out of hibernation to test this new air-box. Sorry, I don't have access to a dyno to get some before and after figures, but my butt dyno should work. Here are some photos just after the new air-box was delivered, showing the OE air-box, the modified version and both side by side.