Hi, I'm currently rebuilding my EM1 and was wondering what sized piping for the catback would be the optimum in terms of power? All it has so far is a whale penis, and soon to be a 4-1 JDM header. thanks!
Hi, I'm currently rebuilding my EM1 and was wondering what sized piping for the catback would be the optimum in terms of power? All it has so far is a whale penis, and soon to be a 4-1 JDM header. thanks!