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WR 6"Sport Air Filters

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5.50 LBS
Calculated at checkout

Product Description


WR 6" Sport Air Filters

These are the newest air filter kit for the Weber 40 and 44IDF from WR.  The base and top are machined from 6061 aluminum and the screen is an aluminum stamping that gives a look very similar to the original Knecht filters, but that's the only similarity. The WR filters use a K&N type inner filter element which is far superior to the original oiled wire mesh of the Knecht, and they incorporate a set of 4" tall air horns to optimize the resonance length of the intake on the 356 and 912. This optimum length has been dyno proven to increase power in the mid range. The spread of this increase is between 3000 and 5000 rpm depending on the camshaft and engine size.

The dyno test below shows the results on a 1720cc engine that was built by a local SoCal repair shop. We tested the engine on our Superflow 902S engine dyno and the results are impressive. The first run was with adapters and the stock SC/912 Knecht filters; the second test used our new WR filters but with the shorter 2.25" air horns; the final test was after switching to 4" air horns. We checked the fuel curve at each test, and the two tests with air horns actually required a slightly larger air corrector jet because the fuel stand-off was being captured better buy the air horns. Oil temps and head temps were also identical. 

The test driving in the car also confirmed an increase in throttle response and power in the mid range. Often, and increase will shop up on the dyno but is not really noticeable in the car...the WR filters give a noticeable improvement in power. They also give a more throaty sound to the intake. 

The WR 6" Sport Air Filters are standard on our WR 1.9 and WR 2.2 engines, but this was the first time we tested them on a stock 1.7. The results are equally impressive.

They fit perfectly on any 356 Coupe with Webers. The 356 Cab, Roadster, and Speedster require a relocation plate for the voltage regulator, also available from WR. For 912s the driver's side hinge must be modified by relocating the deck lid gas shock to the other side and removing the attaching bracket. We can do this at WR if you send us your hinge. Alternatively, our previous version of the 6" air filter is available (please call for photos). 


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