I'm having the same problem since I had my FI cat-back installed. Between 2500-3000 RPM (which is the point where the exhaust is the loudest), I often get a bad rattle coming from the dash. I'm going to see if I can get someone to fix it, as it is embarrassing.
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2009 Magnetic Black 370Z with Touring, Sports and Navigation Packages--Fast Intentions CBE with 12" Resonators/Carbon Fiber Mufflers and LTH--Stillen G3 Cold Air Intakes, Underdrive Pulley and Grounding Kit--Uprev Tune
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