The only difference that is proven is the difference in cost. IRC<Zbomb<IM. No one that I'm aware of has dynoed all three back to back to back. brads955 has posted up that from what he's seen the IRC doesn't produce as good of a result as the Zbomb and that the IM is limited in how it can undo the timing retard. Maybe he'll chime in for clarification.I have read that all three of this product have been used to get back the missing Horse power of the US models.
My question is, is there a difference in end results?