Hi people, just a quick one tonight. I'm installing my Gen 4 Hotshot header tomorrow. The bolts are soaking in liquid wrench. Anyway on the stock exhaust manifold the O2 sensor gets a reading off all four pipes. (where they all come together before the mid-pipe) Well on the Gen 4 the port for the O2 sensor will only take a reading off one exhaust runner. The computer then would have its O2 reading cut by 75% compared to what it used it have with the stock unit. I know a lot of people have this header here, so give me a shout and let me know if you have had any problems, or noticed your car was running richer or leaner. It just seems like something weird will happen. Maybe I'm just paranoid. Am I??? Thanks