Offenhauser 4bbl intake value

Ditto on "single exhaust is fine". The HiPo 273 V-8 cars had a single exhaust. Story is the factory tested dual exhaust and found the single gave more HP. Many will remember the 1970's 4 cyl motorcycles which had individual exhaust pipes. Cycle magazines were full of ads for "4 into 1 exhaust, 20% more power". Finally, Honda and others shipped w/ "4 into 1" exhaust and the same companies didn't skip a beat advertising "4 separate pipes, 20% more power".