HOW MUCH BOOST CAN A STOCK Y8 HANDLE?

 

i have seen them push over 200 whp. and last pretty long. depends mostly on your tuner and how you drive it everyday.
only thing with the y8 they spin bearings easier then the z6. something with the oiling system.

 

stock y8 can handle up to 250 hp. around 10 psi

 

You can't say that it will handle X number of psi. It's how much power the stock internals can handle. The psi is going to depend on the turbo being used. Keep it around 200 whp to play it safe. I wouldn't go towards 250 but that's just me. I think you're pushing it at that point.