LOL nope not the filter, I think the issue is internal, If its only happening with RPM and not vechicle speed i think its inside the engine...UNLESS, When i was backing out my steep driveway, The passenger rear tire went out the driveway first, so it was hanging about 5-6 inches lower than the rest of the car, THEN i heard that hissing noise on the driverside of the engine.
As soon as the car or rear wheels leveled out, the noise went away.
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