If you think that the Cup Car guys have their headers really dialed in for the maximum output then think again. If you have spent the cash for hi-end equal length headers then, to avoid a big upset over wasted dollars, avoid watching this video where DV really lets one and all know where the pro's are going seriously wrong on header design. He also gives some charts and graphs that will let you easily (yes easily) spec out what your motor wants header wise not some motor vaguely similar. Once again DV is delivering groundbreaking tech you will not find on any other channel.