04-05 Performance Chips for 645ci
Can't help but notice a shortage of choices for these year models. One (Surge) requires running wires to the intake and exhaust sensors. Another (X2)doesn't really show where the wires are going to run and doesn't disclose it in the ads. Is there a plug in solution such as the ones I see for 06 and up that I am just not finding? If not, anyone out there with experience using the Surge 02 Chip combo or the X2?