RE: ...DPFI to MPFI...
si/ex ecu= pm6.......you can also use the 88-89 teggie pg7 ecu and the 90-91 teggie pr4. you will also need a 88-91 crx/civic si,hf,ex distributor, 4 88-91 civic/crx, ex, si injectors, 88-91 crx/civic si,ex intake manifold. since you have the resistor box the rest is labor in wiring.
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