does anybody know if a 99 si computer work in a 00ex vtec and if so would it work better then the stock computer....thanks for the help.

I don't think it will work. Although they are both Vtec, the si is a B series DOHC while the EX is a D series SOHC.

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Apexi Boost Gauge, Apexi Meter Control Unit, RMR C/F Gauge Pod, Blitz Fatt DC III, Rexpeed Apex VG

i thinkit will "work" as in run. but i dont think it will work very well. and ive heard of motors being blown from using the wrong computer. the fuel maps are set up for that motor.

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Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.

thanks for your help with this matter.........this is all new to me.