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Originally Posted by antmanc
This May seem like a simple and obvious question, but what quantifiable advantages do I stand to recognize by purchasing a full blown cat back system vs. performance muffler?
For example, The Flowmaster 70 series complete cat back system seems to replicate the stock system until it obviously enters the muffler? Would I not stand to see the same benefit by upgrading stock muffler to FLowmaster 70 series performance muffler?
Thanks.
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Short answer: Less restriction.
Your stock system using smaller diameter pipes than the Flowmaster or any other cat-back. Also, take a look at your Y-pipe next time you get a chance. It's hard to describe, but if you see it you'll know what I'm talking about.