Originally posted by gdog
Since this is a 4-2-1, how has your low-end been affected? All the headers I've seen (typically 4-1) have lost low rpm power.
4-1 headers most always have less torque than 4-2-1 designs. Just throwing the header on lost a slight amount of low end compared to a stock manifold. After installing the unichip and tuning low end is definately more than ever before. The car peaked to .9 bar at 3100 RPM in forth gear before installing engine managment. Now after tuning, the car peaks at 1.2 bar by 2900 RPM in forth gear. In short, I definately reccomend a form of engine managment to maximize the potential of this header.