I have a Stillen true dual stainless steel exhaust system for sale. I had it on my G35c for 1200-1500 miles. It will also fit the Z by not incorporating the two extension pipes. I just put the Borla system on which was a mistake but I'm getting tired of changing out the exhaust. The Stillen and the Borla sound pretty much the same. Actually, the Borla is just a little quieter. You can't hear either one of them at idle. The Stillen has 2.5" pipes and the Borla has 2.25". The Stillen has beautiful polished mufflers (2). I paid $1280 for this system and will sell it for $900 plus shipping from Iowa. That's a 25% discount!
lebushaw@inav.net or lebushaw@rockwellcollins.com