Think of all those Mark 4's out there and how many turbo kits there are for them for a sec. Ok now look into a 1JZ all of those kits fit I have already checked into it with Jotech here in Dallas we took the twins off mine and everything is a perfect match. And also there is no twin turbo 3.0 in Japan the motors over there were the same as here for the most part except in the 90's there they got the 1GGTE and the 1JZGTE. The 1GGTE is a 2.0 twin turbo and the 1JZGTE is a 2.5 twin turbo. The 1JZGTE was basically the first 2JZ in a sense because Toyota took the motor changed the stroke and a few other things and wala. Also from what you are asking about how much HP you can get out of a 1JZ the block will handle 700+ without and mods to the inside that is pretty substantial.
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1987 supra NA 5 speed
1JZGTE swap
Tokico Illumina 2 and Eibach springs
Tokico pillow blocks
Suspension Techniques front and rear sway bar
HKS super dragger cat-back exhaust plus test pipe
Greddy Profec B spec 2 boost controller
HKS type 1 turbo timer
Supra sport solid steel drive shaft
Walboro 255 fuel pump
JZA70 Front end mod
18" Volk Racing AV3 18x8.5 front 18x9.5 rear
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