I asked a similar question but wanted to know if the MSD 2 step would work with the stock converter. Zero answers so far. Im going to assume for me it will not do much. I plan to go with the 4C soon so I will follow this thread and see what is said.
2012 Grabber blue, Auto, Eibach pro street S coilovers, MM caster/camber plates, Borla ATAK cat back, off road X pipe, A.E.M CAI, SCT-x4 Mike Roush tune,SR LCA's, BMR Relocation brackets, J&M Pan hard bar, UPR Catch can, SVE 15x10's, Mickey T's 275-60-15.