ive been digging around here looking for as much info on rebuilt turbos and ive found some stuff mostly based on "if your going to do something do it right the first time", but how long do rebuild turbos last?
In the long run would it be better to buy a set of rebuilt turbos or a set of low mile stocks? also where can i find low mile stock turbos? and i dont want to upgrade cause im not going to be pushing more that 400-450hp....

Well that mostly depends on the quality of the rebuild. Turbos probably see the harshest conditions of just about any engine part. If they aren't put together right then they tend to develope leaks. Anyway, you got PM.

I agree specially since turbo installs in the Z32 are not like a regular bolt on mod you want to make sure whatever you pick will last a while not an area to be cheap in.

how much boost can you run on a stock turbo "safely", im running 13.5 psi right now

Stock turbos should run 16-17 psi without any major problems. An older set may not push that hard but 15 psi is pretty much the limit of the stock fuel injectors anyway.

like these guys said...you want to make sure that a highly qualified shop rebuilds them. there is a shop near my house that just custom built a turbo for an Audi A4 that ended up winning a Rally race somewhere in italy or something. anyways, the turbos they rebuild come with a 24k mile 2 year waranty. it doesnt get much better than that and that would be the only type of shop that i would take use turbos too.

but if i were you i would just buy upgraded ones if your considering brand new ones or rebuilt ones. why strain the stockers when you can just get an upgraded set that are made for the boost levels your looking at. sport 500's would be the turbo of choice as it has similar to stock spool-up but can handle a bit more power efficiently.

Well it might not be as much of a stretch as one might imagine. See here:

www.itsgotturbo.com

The stock turbos can support on average probably in the low 400rwhp range as a practical maximum. Given some more attention to supporting upgrades like a cam set or honed intake/exhaust manifolds and things of that nature, as well as a good tuning on the dyno, and the 450rwhp area is probably the upper end of their potential. I'm sure someone could squeeze 500rwhp out of them given enough work but that is surely the end of the line. If you are looking for 400-450 horsepower at the flywheel then the stock turbos are more than you'll need.

Well it might not be as much of a stretch as one might imagine. See here:

www.itsgotturbo.com

The stock turbos can support on average probably in the low 400rwhp range as a practical maximum. Given some more attention to supporting upgrades like a cam set or honed intake/exhaust manifolds and things of that nature, as well as a good tuning on the dyno, and the 450rwhp area is probably the upper end of their potential. I'm sure someone could squeeze 500rwhp out of them given enough work but that is surely the end of the line. If you are looking for 400-450 horsepower at the flywheel then the stock turbos are more than you'll need.

true, but i was saying. for the money you spend to get brand new turbos or even your turbos rebuilt at a good shop. you might as well chip in the extra change and get the sport 500's and wont really have to worry about a maximum until you build your engine. i find it much more practical and efficient in the long run...

seriously, if your running a consistent 15-16psi of boost on the stock turbos they arent going to last 120k miles like they would if they were only boosting 8-9psi. its your choice but i think it would be wiser to just chip in the extra change and get the sport 500's or an equivalent turbo to that of the sport 500.