MISHIMOTO BMW E9X 3-Series N54 N55 Intercooler, 2006-2013

The E90 BMW platform delivers exceptional versatility, offering comfortable highway refinement during the week and capable performance on the track. With minor upgrades, the straight‑six engine produces significantly more power, but increased output quickly exceeds the capacity of the factory charge‑air system. The stock tube‑and‑fin intercooler is especially prone to heat soak, reducing consistency and overall performance.

Mishimoto addresses this limitation with a high‑efficiency bar‑and‑plate intercooler engineered specifically for the BMW 335i, 335xi, and 135i. This direct‑fit unit provides a 22‑percent increase in core volume and installs without any vehicle modification. Cast end tanks and CNC‑machined aluminum quick‑disconnect fittings ensure seamless integration with the factory intercooler piping.

On‑road and track testing shows a 35°F reduction in intake temperatures and gains of more than 20 horsepower while maintaining factory boost pressure across the core. Precision TIG‑welded construction and a choice of silver or black finish deliver both durability and a refined appearance. With a straightforward one‑hour installation, substantial cooling improvements, and Mishimoto’s lifetime warranty, this intercooler is the ideal upgrade for replacing the stock heat‑soaked unit.