Just saw this post on another board. Rogue Engineering is looking for a volunteer to test their new exhaust for the M5.
Here's the link.
"Thinking about an exhaust for your E39 M5 but are torn between the current choices?
Rogue Engineering is looking for a single E39 M5 owner interested in testing a new exhaust we have. There are no obligations to buy it, but basically the chance to try it for FREE.
Install will be at our location, free of charge. After the testing period, we will gladly reinstall your stock system as well (that is if we can pry the new exhaust from your hands!).
Contact me privately by email first (ben@rogueengineering.com). We'd prefer a local Northern NJ candidate first.
Feel free to crosspost this to other boards."