APR is pleased to present an exciting new enhancement to our S8 4.0 TFSI ECU Upgrade! Expect higher peak numbers of 667 HP/697 FT-LBS on 93 (R+M)/2 octane and up to 692 HP/713 FT-LBS on 100 (R+M)/2 octane race fuel with our version 1.1 update. As much as +171 HP and +191 FT-LBS of torque is available through the power band and the update delivers a more refined driving experience! This update is free for existing APR ECU customers and is available around the world. Read more on our product page.