I'd be very interested in a solution for the blacktop 1.8 Zetec. This has a standard Focus filter box mounted ahead of the engine, fed by a corrugated hose which extends downwards about 50cm to just below the rad. The outlet of the filter box is connected directly to the MAF, then an "elephant trunk" about 50cm long carries air to the single throttle body. There are lots of bends in this system, though the elephants trunk appears smooth.

I replaced the standard Ford panel filter in mine with a K&N filter, and it did make a small but noticeable improvement, with no change in intake noise.

Presumably an ITG Maxogen system or similar could be fitted, to replace the Focus filter box, but would still require a feed hose, and the MAF housing would have to be accommodated too. I wonder if the Pipercross universal system could be used?

http://www.pipercross.net/fastroad/products_universal.asp

Nigel

Last edited by nputtick; 10/03/10 12:42 PM.