I recently purchased a used 2006 Charger R/T. The previous owner had installed Flowmaster 44 mufflers and removed the resonators. The sound was good, but a little loud for my taste, and the drone was unbearable. I sent Bob an email asking for his advice. He made a recommendation and I bought his resonatorss and some stainless tips to go along with them. I had the resos installed today and I'm much happier with the sound. It's just a little louder than the stock exhaust on my 2006 Daytona, but it growls like it should at WOT. And the best part is that the drone is gone. Thanks to Bob for taking the time to answer my emails and providing excellent service.