if you are going to buy a used turbo, from someone you dont know or trust,lol, always buy thinking that you will have to rebuild the turbo..or just buy one brand new from cheapturbo.com they have free shipping and some hella good prices too.

Also tecnic on the kit you posted...everything in that kit is brand new..the piping is just cutting and thats it..the kit comes with couplings or you get it welded together, the only fuel upgrade you would have to do is get some 440 injectors to run with the hondata..thats the best price ive seen on a brand new turbo kit with hondata 2700+240 for injectors+about 400 bucks for dyno time..and you are still under 3500 for a boosted C5 and a fully tuned hondata. you can always add the 3inch exhaust later.and you dont need a bigger radiator.