Bigdog,

I use Royal Muffler in Lee's Summit, I used
Dynomax Super Turbo's p/n 17734. Bought online from Auto part express 80.00 for both delivered
to my door. Royal muffler custom fitted & welded in my exhaust on my 67 400, 2.5 inch with h pipe,
to mufflers, to 2.25 exhaust. 265.00 I can send you pics if you want. Good Luck
Mark