At this point in time, the best recipe for a beastly BMW N20 has already been firmly established. The most popular modifications that will take your BMW N20 engine to the next level include either a piggyback or flash tune, a catless downpipe, an upgraded front mount intercooler, an upgraded intake, and fueling mods like E85. With these mods, it is possible to reach the 350 horsepower milestone from a BMW N20 engine.