A cat back system generaly is everything from the catalyst toward the rear of the car. Which include mufflers, tailpipes, and tips. Some systems have the mufflers welded onto the rest of the tail pipes making it a two piece system. SLP makes their system in 3 pieces which makes installation a piece of cake. Some systems have mid inlet pipes, mufflers, talipipes, and tips. Depends on what system you want to use. This gerneraly is how a cat back system is defined.
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