trying to make serious horsepower in almost any of the Toyota motors will be extremely expensive, whether 1UZ, 3UZ, or any JZ variant as well...
All of these motors can be made turbo charged for a fraction of the cost of making real power N/A...
a 12.5 in the 1/4 will require 300-350 wheel hp in an IS or GS... This will require at minimum cams, individual throttle bodies, ported head(s), bigger valves, etc... Even then, they would benefit from even higher compression ratio and a very efficient exhaust...
-cody: maintenance forum moderator
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2001 Lexus IS300 - 500whp/476wtq (Mustang Dyno)PTE 6765/Custom AEM EMS - Auburn Sky Pearl (1 of 1348)
1999 Isuzu VehiCross 285/75-16 Destination MT's - Astral Silver Metallic (1 of 1021)