It will vibrate. I'm pretty sure what you are hearing is the exhaust touching the crossmember. Mine didn't touch either, but when running and vibrating some it would. I just put a thick washer on every bolt hole between the cross brace and the car and it solved the problem.
I have Gemini + Berk test pipes.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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