I have a LSD performance exhaust on my 08 Civic si sedan and I sold my original exhaust to buy this one. I have owned the exhaust for 2 months and my 16 month old daughter gets fussy riding in the back seat of my car and I think it's mainly because of the exhaust so I'd like to trade this exhaust for a stock exhaust. It is just a catback system and I dont have the box or paperwork anymore. I ordered it brand new online at LSD motorsports.com please hit me up or text me if your interested number is 256-476-2019