BMW: Basic Bolt-On Power for the E39 M5-Part 2: Headers and new software

摘要

To recap from the last time we tested this E39 BMW M5 (10/03), we realized sizeable gains from basic performance upgrades. With help from a pair of replacement air filters, a Supersprint cat-back exhaust with cross-over pipe, evosport power pulleys, Denso Indium plugs and evosport software, the car climbed from an already strong 345 whp to an even stronger 365 whp. The entire evosport Stage 1 package retails for $3,799, not including the $720 installation charge. Meanwhile, I was waiting for the highly anticipated Supersprint headers and high-flow catalytic converters. Supersprint North America finally got its hands on the first set in the country and shipped it to us. We once again chose one of its largest distributors, evosport, for installation and testing, especially since evosport now uses these headers as part of its Stage 2 power package for the M5, which includes software.