you are aware that the gxp ls4 5.3L needs a 3 inch for best performance right....its not a v6Originally Posted by coolone
No need (stay 2-1/2"), there are 3" in/out mufflers available
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05-01-2013
you are aware that the gxp ls4 5.3L needs a 3 inch for best performance right....its not a v6No need (stay 2-1/2"), there are 3" in/out mufflers available
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