You will find that it quiets down substantially over then next several hundred miles. I measured a 3-4dB in-car drop. I haven't seen an explaination of this posted. Stillen claims they pack the resonators and muffler with "imported" steel wool (as opposed to fiberglass for some other systems). Perhaps this simply compacts in time, or partially fills with soot?!? My measurements of the various exhaust at our dyno-day showed that Borla and Stillen on sedans are equally loud (outside the car).

2004.5 G35 Sedan | Garnet Fire + Willow | 6MT | Z-Tube, K&N panel | Stillen Cat-Back

 

I've had the Stillen for six months now. If you are looking for a queit exhaust, this is not it. It's meant to have a growl and perform. After Dynomating, there was minimal change, over the months can't say that the sound has quited down at all. The drone is there, but you get use to it, or reminded about it when it's cold.

 

I recently took my Borla off.
Too much flack from the co-pilot.
But she doesn't like the radio volume past 12 either.

It would be far to expensive to trade the co-pilot, so the Borla had to go

(BTW it's posted in the parts for sale)

<font color=blue>04 Silverstone G35, 5AT, Prem, Aero
ES100 225/45-18 front 245/40-18 rear
HKS & Y-pipe, Z-tube, Eibach, 35%Tints</font color=blue>

 

inTgr8r, here's a link to a post to help you sell your Borla sedan exhaust. It's a owner generated before and after dyno that show's how much power the Borla sedan exhaust makes
Baseline dyno has: Crawford plenum/Z-tube/K&N filter panel/Magnaflow exhaust resonator

9hp
6ft lbs

http://forums.freshalloy.com/ubbthre...e#Post67658669

"All that's necessary for the forces of evil to win in the world is for enough good men to do nothing.”
Edmund Burke

G35 6mt