My buddy has a 67 Pickup w/ a 406 in it! He has a pair of Flowmaster Delta Flow 40s on there. There is no tinny sound to it like the originals..and when he jumps on it ..oh yeah there's an edge alright!

Best muffler on the market and I can't get enough of his truck. I'm putting the exact mufflers on my Impala (454) but 3"

Happy hunting!