Here are pics of the ypipe install...I had to use band clamps temporarily on two of the connections...this is not recommended because on slip fits they tend to distort and not give a good seal on the smaller tubing.
This is how the passenger side turned out.  Dont forget to reconnect your front o2's using extensions...i purchased 24" extensions for mine or you could use the DIY version supplied in the kit or if you purchased from TSP I think they give you decent extensions...just remember the fronts need to be connected not the rears.
Its up to you but I didnt purchase sims cuz I know im getting tuned with ls1 edit soon...but you really should do one or the other to get your ses light to go away...mine came on after the first test cycle because I just left my rears unplugged...It wont give you any problems other than the ses because the rears are basically only there to say "hey your cats arent working properly"
Last shot and your done It seems hopefully...just get those extensions tucked up out of the way I used some zip ties as they worked fine for me.  Happy motoring.