A B18B1 provides a whopping 127 ft/lbs of torque. A B18C1 includes a head blowing 128. The B1 just has a broader torque assortment and an before torque peak Click on to increase...ryukkid explained: they provide obd2 to 0bd1 jumper harness for each the distributor along with the ecu Click on to extend...Interchangeable Sections early b20a and b21a