Follow-up to my previous post. Talked to BB today and got a promise that they would look into the setup for '06 QC's to see if any design issues. They were obviously skeptical that anything could be wrong with their system and indicated they sell a lot of them without any complaints. My sense based on my experience and comments here is that they have issues with this catback system for '06 QC trucks, as the 4 piece QC extensions are the primary trouble point. Live and learn, but I will not purchase Billy Boat again based on this experience. For a positive reference, I have been extremely pleased with catbacks purchased from Solo and TNT for other Viper/SRT vehicles I own.