This is the way to go, in my opinion, road and track. I ordered mine directly from ITG since I wanted them with a stainless steel flame trap layer (not exactly cheap). The latter is important if you run Webers or similar carbs! Their life span is limited to a few years though! When the foam starts to disintegrate it's time to get new ones.ITG JC70 Raceair "Sausage" Racing Air Filter w/Plate, each - Pegasus Auto Racing Supplies
The ITG Raceair JC70 sausage air filter was designed for Cosworth DFV Formula 1 engines, but it is also popular on 4-cylinder BDA FA engines.www.pegasusautoracing.com
I have thought of this very thing!Seal the Turkey pan to bottom portion under rear clip
Add additional Perspex /polycarbonate window to front of rear clip
Add filter material to each side of air inlets
Leave trumpets open as all air under the rear window has been filtered through the side inlets
Ian
I like these better than the individual air cleaners.