I got word from John (S14power.com) in Germany that he has modified their S50 airboxes to have an internal air filter, much like the CSL box for the S54. (E46 M3)

This is great news for those that have dropped one in an E30. There isn’t much room to install a filter on the end of my intake due to the limited space caused by the ABS unit and Larger PWR radiator.

The only negative to these is that you don’t see the intake trumpets as well since they are hidden. This is probably necessary because of the internal filter. Still looks sick though!

John’s boxes are some of the best in the business and he’s a great guy to work with, so don’t hesitate to purchase from him.

Here are the pics and link to pricing for this and other boxes as well:

John’s Carbon Fiber Airboxes