You're correct; my apologies for the oversight. The 20 hp gain is not specified for the do88 intake system. Let's correct that:Do88 Performance Intake System for BMW M140i/M240i/340i/440i F3X (B58)The do88 intake system for BMW M140i, M240i, 340i, and 440i (F3X) with the B58 engine is engineered for..