I have a 2004 5AT sedan. Looking to change up exhaust. I am planning on getting Hi Flow Cats and a Motordyne XYZ pipe with a coupe midpipe. Just curious is that seems like a good set up since I don't plan on doing a full cat back exhaust. I am new G owner so cut me some slack just trying to see what you all think. Also putting a MD 5/16 plenum spacer and a Z tube with K&N drop in filter on it soon. Any feedback would be greatly appreciated!

 

Welcome to the G35 Driver forums tbolding! Sounds good thus far, Fast Intention HFCs have the best reputation for quality and sound! I wouldn't put Berks on my Honda! (lawnmower) Understand you're unleashing massive increase in volume to the rest of your exhaust system so you may create some rasp at high RPM's! A high flow muffler like Magnaflow might decrease the rasp if it bothers you!
Again, welcome and enjoy the ride...Gary