[TheBreeze]

I have the CP-E axleback with stealth pipe, stock N55 mids, stock DPs on my PPK1-equipped N54 6MT car. I get very noticeable drone from this very conservative set-up, so it would not surprise me if a more aggressive setup would be unbearable. On mine, there is significant droning depending on slopes and speed which I get around by varying my speed slightly. Mostly I live with it because I really like the way it sounds otherwise. I love the way it rumbles the house when I start it in the garage :-).