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A followup question:
While I like these headers just fine, I've have noticed something mildly bothersome that didn't exist prior to their installation. At right about 2100 RPM I get this humming vibration that you can actually feel as well as hear. It goes away above and below that RPM. It feels like it's vibrating through the frame of the car---if I have my leg leaning against the console to the right of the accelerator petal, it actually vibrates my shin bone!
Unfortunately, I can't reproduce the vibration while sitting in neutral and bringing the RPMs up to 2100. It only occurs while the engine is under load, ie car in motion. I've checked/tightened the header bolts (they were fine) and am not sure what else the explanation could be.
Has anyone else experienced this?
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