Originally Posted by Andrew@ActiveAutowerke
Exhaust install Tips:
Do not tighten the exhaust clamp more than snug until the exhaust is completely set where you want it.
Be sure its not close to the bumper as it will usually move a little after install and driving. If it does move re adjust once more.
I guess some of the other forum members who are close by need to bring it to your shop. Eventually you can get an idea of where our installs went wrong. Under load in pretty much any gear, the boomy noise is present between 2000-2500 RPM. On a constant cruise, say 6th gear at 65mph, its just a little louder than stock until you need to accelerate. Is that your definition of drone or is it different? I feel like its more of a resonance issue, so the question is what is causing it.