Category: Porsche 911/997 Tuning & Styling Car: Porsche 911/997 Part: Moshammer rear diffuser turbo MK1 not painted, street approved. newly developed rear diffuser improves the downforce.Through the interplay of the diffuser with the smooth underbody of the 997 Turbo,creates a so-called negative ground effect "inverted wing profile" which supports the stabilization of driving behavior.Currently only usable on the Porsche 997 Turbo Mk1 model 2006-2009. Part No.: TC-P997.10.3040