Got my Fast Intentions exhaust and HFCs as well as 4.08 gears installed over the weekend. The sound is amazing, I really missed having a FI exhaust. The FI HFCs sound even deeper than my Berks did on the '09 Z. As far as power - holy crap! I can't believe how much the exhaust and gears open up the car. I have a permanent grin on my face every time I drive this car now.
Anyway, here are a few pics of the install
Stock cat vs FI HFC
Stock vs FI pipe diameter differences
Unbolting the rear diff
Rear diff it out (not very difficult at all)
4.08 gears installed
Bolting it all back up
All done!
