Have brand new 2.5" center Vibrant Resonators. Most Z's and G's with custom exhaust use Vibrant to get rid of drone and rasp. These are best installed by a muffler shop or your tuner as welding may be required. Stainless steel built, great quality.
Offering cheaper than Amazon and anyone else online. 100 shipped to continental US.
http://i.imgur.com/2BMqRp2.jpg
http://i.imgur.com/Gnnsr40.jpg