"BMW E46 M3 Transformed with Insane 10-into-1 Headers and V10 Swap"

TL;DR
The Driftworks V10 E46 M3, originally built with an S85 V10 engine from an E60 BMW M5, has been upgraded with custom 10-into-1 headers from Celeritech. These headers not only aim to increase power by optimizing exhaust gas scavenging, but also create a unique and higher-pitched exhaust note. The car, which was recently restored by Driftworks, features a five-exit exhaust system and offers the option of an open exhaust dump. While power gains have not been measured yet, the focus of the upgrade was on style and sound.
Want the full story? Read the original reporting
Read on The Drive