TTE850 Turbo Upgrade, B9 S4/S5/SQ5 EA839 3.0TWe at GAS are proud to have been given the opportunity to perform beta testing on the new TTE850, and have already extracted over 730bhp 745btq (the safe limit of the stock EA839 engine before lifting heads) on an E40 blend, an increase of 380bhp over stock! These numbers were achieved at very low wastegate duty cycles, meaning this new turbo can achieve power numbers that far surpass the stock engine limits. Over 800ft lbs of torque was achieved back