Alright, just got back from the Sampson website. I looked at mufflers for the RK. Most were $350. Then looked at the True Dual Crossover. What exactly is a crossover? This crossover is $470. When looking at the mufflers, it stated you could use stock or the True Dual Crossovers. Are there performance/sound differences when using this type of system over stock with an aftermarket muffler? Do you get performance/sound when just using the stock with mufflers? I am also assuming that these mufflers are considered slip-ons. For the RK, do you also have to worry with heat shields? Thanks in advance. Oh, adding up the Crossover with a set of mufflers, that is over $800 not considering S&H and installation. Fu(k that's expensive! J.T.