Just posted this in another Invidia Gemini thread people mentioning same thing in the other thread.
I had both Invidia test pipes and now their HFC's and I believe that due to you don't use the bracket that bolts the stock cats to the trans. However this past August Invidia redesigned their Y section and removed the flex pipes bc they would eventually start to flex to much and leak. I suffered from this and they replaced my Y section under warranty with the new design free of charge. The new design features slide in flex section with a spring. Ever since that was done no more rattle/vibrate.
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2013 Ford Mustang GT 5.0 6MT ROUSH intake | ROUSH axle back | ROUSH shift knob | ROUSH coil covers 2009 NISSAN 370Z SOLD
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