This kit I guess I would call the sport system. The only difference between the extreme and the sport is the resonator delete pipe, that can be bought from corsa for under $200 or have a local shop make one for under $100. Exhaust has less then 10k miles on it. I removed it before I got rid of of my 2010, the 2013 I bought already has corsa, otherwise it would never be for sale. My opinion this is hands done the best exhaust for a raptor! Has 0 drone and sounds amazing when your on it. The kit new is around $1000, I'm asking $650!