The Pusher SuperMax Y-Bridge for Duramax LBZ & LMM trucks properly guides air into each cylinder head while increasing air flow 45% more than the factory components. This one piece patent pending design is constructed from fully TIG welded, 3" mandrel bent tubing and allows easy access to all eight flange bolts. - CNC machined flanges for flawless mounting to your Duramax engine. - This y-bridge is compatible with the Pusher Max Compound Turbo System for the LBZ trucks. - Included are new o-ring