I have Berk Test Pipe installed on my Z for about 5 months now, and I love them. I love the raw exhaust note they make and I noticed a small HP gain. The test pipe does make the exhaust a little louder but at speed my wife and I are able to have conversations while speaking in a normal voice. The only thing I recommend is doing the non-fouler method while installed the test pipe, for preventing the SES light from coming on. Its really easy and there is a post about it in the DIY section.
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I will miss my Z. I hope she goes to a good home.
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