cat back exhaust is replacing everything behind the convertor (pipes, muffler) any muffler shop probably will put it on for you for a price (usually an hour labor) the stock muffler and pipes are very restrictive due to noise/emissions standards. A cat back system will look, sound, and perform a lot better than stock.
I was quoted $150 for the custom exhaust tubing and installation from Meineke if I brought in my own muffler. So total, the exhaust will cost me roughly $200 for a custom single muffler dual tip setup.
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