dude real talk cheap **** doesn't necessarily mean problems...

just make sure its good... the only thing bad I can forsee is if the used turbo you get is blown, and even then 100$ will fix it... might even be better to get a not so good one to begin with... so u can rebuild it and make sure its good.

at 6-9 lbs... nothing really bad will happen... just get some 450's and get it professionally dyno tuned so u can keep it reliable.