I unknowingly did a similar test. I installed a K&N type filter, only thing it did was to make the intake noise louder. But then I installed a high flow muffler, the rest of the exhaust is 100% stock, and MPG did go up, no doubt from the combination of less restriction on BOTH ends of the motor. I calculate my mileage, and there could be errors, but overall I was getting about 2mpg more
no doubt from the combination of less restriction on BOTH ends of the motor.
Now don't take this the wrong way or anything
But there's no such thing as the "no dobut" test At least not with any verifiable/repeatable testhing.
The easiest way to test.... Do A-B-A testing with a paper element and your new muffler Even compare to no filter at all o.0 I've stayed away from oiled, washable filters based only on oil analysis testing -- In almost all cases, much higher silica numbers My point is... simply testing flow isn't necessarily a complete test - after all, it's a filter so a good question is "how good does it filter?"
Time is the best teacher. Unfortunately it kills all its students.
They claim that they increase intake manifold plenum volume gas mileage and power by causeing the incoming air charge to tumble for better atomization of the mixture downstream in the combustion chamber. It looks like the same theory as the tornado and other products, but instead of creating turbulence right after the filter, it raises the throttle body and has small grooves in it. Simple solutions are most often the best, but this seems too simple and I realy don't understand how hundrids of automotive engineers could miss somthing so obvious. Here is one of their websites.