Wow! Did'nt know some were so passionate about exhaust. Thought we were the only ones. Up to about 2 years ago when a 71 440 "B" body exhaust system was ordered we automatically sent the customer an h-pipe exhaust system thinking that this was correct. Then we got straightened out by a few 71 "B" experts in the field concerning what was correct regarding the exhaust. We had no way to prove otherwise by either documentation or by reviewing existing survivor cars. So now we automatically send (2) headpipes unless a customer opts for an optional h-pipe for 71 440 applications. So far this has made most people happy and has kept us out of hot water with the experts. Either way put what you want on the car because most people would'nt know the difference.