A header eliminates the crossover. The crossover allows for the exhaust pulses from one cylinder to be distributed and muffled by two mufflers to meet the EPA's 84 dB rating requirements.
Adding the headers isolates each cylinder and the end result is a slightly more "choppy" sound and a louder sound with the pulse now going through ONE muffler, and not through two.
Check out the special a few guys just snagged here with the Rineharts full system at half price.
“Peter, arson is a serious crime. It's not like smuggling Oriental hookers into the country, in steel drums........” ~ Glenn Quagmire~