[160B]

I use a K&N E-3050 air filter in an original Airmaze. I have one on my 1931 160B for 30,000 plus miles and also have one on my 1931 68B for 3,000 plus miles. The filter does not cause the engine to run rich and makes a significant improvement on keeping the engine oil cleaner over time. I used to change oil every 500 miles and it was dark and dirty, now I change oil based on color and usually change oil at 1,000 miles or even 1500 miles.