Thanks for the replies. I want to add that I never heard anything like this with the Gen 3 and Fast Intentions fatback installed. I only heard this once the cats were removed and test pipes installed. They are straight test pipes with no resonators and they are hfc. The only resonators I have are the 12" resonators on midsection.
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2009 370Z w/ Sport Package * Red GTR Start Button * GTR Clear Dome Light Lenses * Stillen Gen 3 CAI * Fast Intentions Exhaust w/ 12" Resonators * Z1 SS Test Pipes * Kinetix Camber Kit Front & Rear * SPC Toe Bolts * Z1 Silicone Hoses *
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