AIRTEC Motorsport Intercooler Upgrade for BMW 1 Series and 3 Series Diesel (E-Series) - Pro-Series BlackOur solution to increasing the intercoolers size and performance within the confines of the limited space behind the bumper is based upon a wider, taller core with a huge 150mm depth. This offers a massive 94% increase in overall capacity in comparison to the original intercooler, as well as a significant increase in frontal area over standard, which allows it to make the most of the air flow provided.