I just put on my G.M. Performance parts exhaust on my 05 SS last night I really like it it is not very loud, but after having the Magnaflo muffler put on I had a very loud drone in the cab that just got louder with time so it had to go.The gm kit went in easily it only took me about 45 mins to put on including dropping the old system out.The only gripe I have is that the tail pipe is on to much of an angle downward so I'll have to take it off again and have it bent up a bit.