I mentioned the crossover because I had a 93 5.0 Mustang that I installed Flowmasters on and the drone was so bad that you could not talk or listen to the radio. I contacted Flowmaster and they told me to install the crossover. I told them that I had the stock factory "H" pipe and they said that the crossover in the factory exhaust was not effective with the Flowmasters and I would have to install another crossover to eliminate the drone. I followed their instructions, which did not require the removal of the original crossover tube, and the drone was gone.