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The $799 if an Axle Back and the $1500 is a Cat-Back.
The difference is not just the "X-Pipe".. the Cat-Back replaces the entire Exhaust system whereas the Axle Back just replaces the mufflers.
Basically, those who just want to change their sound with very minor mpg, hp, tq improvements would get the axle back kit.
And those who want to get as much performance from their vehicle would get the Cat-Back for a much higher exhaust flow, at a much higher cost.
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