This came off a 350 chevy motor with headers. (which is also for sale) I think the flowmaster is a series 50. It had a very deep rumble. The motor it was bolted to was cammed up and the system sounded awesome. There are no holes or cracks anywhere. The 3" pipe is all welded, no cheezy clamps. 286-0031 Location: star it's NOT ok to contact this poster with services or other commercial interests idaho