Any ideas on what I would be running in the 1/4 mile with this full bolton setup?

 

I too have a 03 5AT. I thought that the KN/Z-tube gave it a nice sound...the plenum spacer is a must. For your car you don't need the MREV, just the spacer. I agree with what everyone else is saying, plenum + Z-tube. You may also want to consider new brakes.

Not to get into too much detail but the brakes suck a$$ on all G35's prior to 06. A lot of squeeking and brake dust. About 600-700 and you can get a kit that includes SS lines, rotors, and pads...the right kit will really help with the issues. Don't get me wrong, you will nut in your shorts at the stopping power of the stock G brakes compared to most other cars, but squeeking and dirty front tires, along with a short pad life gets old.

 

there might be something wrong with people on this forum OP. Honestly ill take a completely stock motor G with Coilovers, sway bars and BBK before a half *** FI job on a stock motor. Plus you said it your self you got a 100k on the car it might be time to get those struts out.