I've recently learned that the RC 550s I bought awhile back are low impedance. I've also recently learned that the MS HiRes code doesn't support Low Imp. injectors since they had to drop that code to make room (this may be incorrect).

So given the choice, should I go with the HiRes code and run resistors or run the normal code and let the low impedance injectors be low impedance injectors.

(Honestly, I don't even know what the advantages are of low impedance injectors are since I didn't mean to buy them as such... doh)