Kit is $499, not sure where the $642 came from, but go to Jeg's or Summit
and price the following, let's see what you end up spending vs. the kit
2.5" SS pipes from the headers all the way to the tailgate,
(This is a Minimum of 4 standard sticks of Exhaust tubing)
2.5" SS X-pipe, 2 SS Magnaflow Mufflers, and 2 SS tips, &
that is not to mention that all the pipes are Mandrel bent.
(99% of all muffler shop pipes are NOT mandrel bent or SS)
My buddy who runs a shop came up w a price of $450, and
that is his cost on all the pieces above w/out his profit