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Less possible is the IS250 engine not blowing up by running 10 psi
(assuming you're not doing anything like meth injection or physically modding the engine to lower the compression ratio)
If you'd like an example there's a nice thread on my.is where a guy trying to do a 10 psi turbo kit on a 350 (despite everyone telling him he'll blow the motor, and the 350 has slightly lower compression than the 250) posts about his build, and how great it runs at 5 psi... then how he got it running 8 psi and yeah it's running kinda lean but he's sure it'll still be fine... then his next post is about how the motor blew.
This might be why they tell you you have to provide your own, additional, parts to run the 10 psi kit... so they can just disclaim liability and say you used the wrong stuff when you kill the car :P
this procharger is so good, my mechanic did some research and were excited about it the stage 2 is the best way to go stage one isnt safe at all and its actualy a co. in japan and around 6-7 grand