how much hsp
 

i have a 1989 supra turbo,an was wandering how much hsp can my motor handle before she brakes?

it's not really hp that will break it... it's prior maintenance

more than likely you will end up running bout 10psi with intake exhaust and bout 300bhp and blow the stock head gasket (its a possibility)

ensure your motor is happy before you mod it :)

this is what my mods are hks drag cat back,hks downpipe,750 fuel injecters,andto4e turbo.I dont have enough money to put racing pistins in,just want about 350hsp

Those injectors are way too big, you aint got enuf motor for 750's. you can get 350hp from the stock 440's.