I am new to the G37 field but I have a long standing respect for Stillen products. Can anyone chime in for or against for a stillen header back system and why?

 

Well I'll say the full 'catback' 2.5" exhaust they make for the G37 Sedan is pretty loud, especially inside the cabin. Lots of drone with the 7AT transmission during cruising rpm on the highway. Load on the motor in top gear makes it even worse. I wouldn't recommend this exhaust for someone looking at a drone-free setup. I purchased one and sold it immediately because the drone was that bad! Now the folks with the 6MT cars say it's really non-existent so it could be the combo with the 7AT and torque converter which makes it unbearable.

 

I have a 2014 Q60S with the 7sp automatic and love my Stillen set-up. In addition to the cat back system I have their 3rd Gen CAI and feel that any added noise is a non-issue, especially any drone at highway/cruising speed. The addition of HFC's have created a raspy sound under hard acceleration but even that dissapates at cruising speed.

 

I have the stillen exhaust on my M37S and love it, the low rumble is what I was looking for and to me the car is MORE of Blast to drive, like if it wasn't already