Not really, but my 96 lumina 3.1 sounds funny, mainly under load like when i have the A/C running. For all you gear heads out there, it sort of sounds like i'm running pete jackson noisy gears. It has a "whirring" sound that doesn't affect the drivability, but its very annoying. Also, i on;y get maybe 20 to the gallon, much less with the air on...Is this right, or am i missing something?