7.5" High Desity Stepped Core E Chassis Race Intercooler MAD N54 N55 135 1M 335The stock BMW intercooler is small, inefficient, and cannot keep up with the high boost levels that tuned vehicles demand. The MAD BMW 7. 5 Race Intercooler is engineered to keep intake air temperatures under control, allowing your BMW to perform at its best under all driving conditions. Designed specifically for high performance E Chassis applications, the MAD 7. 5 intercooler features a high fin density stepped core for maximum cooling efficiency