I an doing an all motor B series with parts I have laying around. I found a MoTeC M4 with harness, and also an AEM Twinfire. Is it pissible to wire these 2 together and use the M4 AUX outpus as IGN inputs?

 

Huh? The M400 can be used with (4) ignition outputs and (1) aux output. You have no need to do anything funky for outputs to trigger the Twin-Fail.

Unless you're hell bent on having a crappy CDI on the car, either put K-Coils or a Pro14.

 

Also Has 4 KSeries , the 1 dedicated Ign output and 3 Aux output will Work for the M4 and KSeries coils? If yes, then I will do that .

 

As far as I know you can configure either rising/falling, so yes you can.

You have (5) total available outputs, you can use either (1) IGN and (4) Aux 'Distributor', (2) IGN and (1) AUX 'Wasted Spark', (4) IGN and (1) AUX 'Direct Fire COP', etc...get the drift?

http://www.motec.com/m4/m4overview/