Another thing...I'm surprised with all of the Z lovers who no doubt care about detail in all aspects in performance that few people who have done this mention any change in power and responsiveness.
Mine went flat when I put 3 washers in. It had crisp and quick response before so I went to one and it seems to be much better.
I have a stock exhaust and AFE drop ins. Not sure if that make a difference or not. But it makes me wonder if any exhaust on its own really does help power. I write this because opening the exhaust before the muffler reduced back pressure similarly to a cat back I would think and it was amazing how much power it lost.
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