I have the stillen intake and z tube along w/ the motordyne 5/16 spacer and mrev2, I added the intake about 6 months after the motordyne stuff..I feel like my throttle response improved a little, could just be my head. anyway I think its worth it if you can get a good deal.

 

Kinda sam here. A month after I bought my car, has MREV2, MD Spacer and Z-tube installed. Two months late had Stillen intake installed, was told by Riverside Infiniti that it might not make any gains, I disagree. If you have a 6spd. and are planning on doing all breathing mods available, it will make a difference (not huge) and it will also magnify the sound.

 

for myself I went for the INJEN CAI. very satisfied. (I'm in a cold weather, avoiding a bit the effect "heatsoak")

when it reach 3800 rpm BOOMMM !!!!! it sound like a V8.

my only mod by now. but love it.