Well I just broke 2000 miles and the car feels alot stronger.
My z-tube and K&N drop in, sounds alot deeper and louder as well.
Makes sense as the engine breaks in. Can't wait till like 5k or 10k. It will be a monster

that is all

thanks
mike

2004 G35 sedan. Silver/graphite, Premium, sport, aero package. Z-tube, K&N

 

I've got about 6K miles on mine and the sound gets better everyday. Have you noticed a change in the exhaust tone?

2004.5 G35 Sedan 6MT Garnet Fire/Graphite Leather
Premium / Bose / Sport / Aero / Sunroof / Tint / K&N

 

Mike,

I have 48K on mine. It is better than when new!
Add that exhaust and see how much better it gets.

Dave

03 5AT Sedan, sunroof, splashguards, HKS muffler,
14 wire Grounding kit, Z Duct, Stillen HF/AB
Underbody rear diffusers, Drilled alum pedals,
Stillen sway bars S/H. Sport Tuned Suspension