I have a similar setup on my '40 pickup, fitted with a '54 Blue Flame motor. My twin pipes exit at the rear, one each side. I don't know what the mufflers are, but when I hit the loud pedal with my size 15's, it gives a nice bark! My 12 yo grandson loves it. My sons call me the oldest hoon in town.
I must admit that I had some difficulty fitting the headers, and I had to use a die grinder & burr to remove some metal to allow the studs to line up. Also, one header had a flat surface, the other chamfered at the flange. Again, the die grinder came in handy to create the chamfer.
