I have a 1986.5 N/A Supra 5 speed. I actually just bought it yesterday. It has OBX Headers on it. The guy had his brother's mechanic weld on the o2 sensor but they welded in the wrong place so it only reads 3 cylinders so the check engine light comes on. I want some custom fabricated headers for this car. Does anyone know any good companies that do custom fabrication?