getting to 400 hp on a 1uz is gonna be expensive also,Gen 1 89-94 1uz has 245hp (about), gen 2 95-97 has 270 hp with lightweight internals so boost at your own risk (i know ) and Gen 3 98-00 is 290-300 hp with VVTI but iv been reading on swapping the VVTI into my SC but all im reading is how much of a PITA it is. headers, exhaust, intake system like ITB, aftermarket ecu and tuning, cams, head work/shave and a supercharger/turbo might get you to 400 but thats mad money bro....sucks the 1UZ dosnt have aftermarket support like the jz's. it has tons of potential. its really over engineered and loves to rev.