FWIW, I have not had thrown any Cells since installing my HFC's several months ago.
And yes, it is definitely worth the effort in every sense of the word. You will love the sound and performance.
Check out this thread, BERK Catback Exhaust System installs/reviews
Good luck and persevere. 
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G2||Berk CBE/HFC||LED In-Out||35% Tint||V1||GT-R Dome Lights||JDM Rear Fog Light||Z Speed Undershroud (SS)||Red GT-R Start Button||StopTech Rotors||Project MU||Z1 Oil Cooler||EcuTek||
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