Johneye---The tips are Hooker # 22202 Large bore 2 1/2" X 3"
Mark---Im anxious to hear them too. A local guy here dynoed his new 408 and it lost 50 horse with the stock mufflers. I ran my 393 CHI heads engine on a run stand before installation (open headers). Great throttle response. After install with the stock mufflers on I could immediately tell it was choked up. Didnt rev the same. Your vin # is near mine. Is yours originally grabber blue ?