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You do need the ECU to control the VICS (not VRIS) on the 4cyl intake minifold. With out the ECU it won't work. The JDM ECU is extremely rare and if you do come across it, it doesn't match up with our A-spec wiring harness. As for the 10.4:1 compression, the extra tuning is sparkplug gaps and ignition timing and maybe more, oh, and higher octane gas. The cam should be about the only thing that dosn't need tuning. It will just mess with your idle a little.
 
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