I think these short steel packs are the ones I used, I picked them at at the Syracuse Nationals brand new for $20 a piece but they didn't have a name on them. When I'm driving the car they don't sound much louder than the stock system from inside. Behind the car they sound great and my buddy followed me home and said they sounded really good going down the road.
http://www.vanpeltsales.com/FH_web/flathead_speed-mellowtone.htm
