With the AMS full exhuast system, (downpipe, test pipe, and exhuast) how much whp would I gain from a stock evo, without tuning?

 

20-30 whp with the whole sytem

 

will the AMS full system throw a CEL?

 

no cat, or hflow cat will give you CE light, there is a kit to correct this problem $67 bux i belive.

 

the CEL light isnt a guaranteed thing. I have seen cars with our full turbo back and a test pipe not throw a code. In the event that you do throw a code there is a O2 simulator that will clear up that problem.

Eric