Help me!! can the original coil that came with my sr20 be used with my MSD ignition box?

yes it can. I have an Avenir powered B13 SE-R that I put a MSD 6AL box on. WHen I tried to put on the blaster 2 coil the car would just sputter and backfire under boost so I ended up putting the stock coil back on after messing around with different plugs and plug gaps so I know for a fact that it will work.

Jerry.