by Hussain Boxwala
BMW B58TU Build Guide: Supra, M240i, M340i, M440i & More
The one stop guide for modding your B58 powered car. Honest dyno numbers for B58TU tuning. 420-510whp on stock turbo with 93/E40, 700-900whp big turbo. Real builds from Racebox - Supra, M240i, M340i, M440i.