Tri-Y Header System for Holden Commodore VY-VZ AWD Coupe 4/Avalanche XUV HSV 5.7. Pacemaker Headers to suit: HSV VY and VZ Coupe 4 (AWD Monaro), Avalanche (AWD Wagon) and Avalanche XUV (AWD Ute) 5.7 Litre Gen III Automatic TRI-Y design. Models VY Series II and VZ require Oxygen Sensor Wiring Loom Extensions. VY Series II Extensions Part No PEX5367Y x 1. VZ 5.7Ltr Extensions Part No PEX5367Z x 1. Part #: PH 5366. E. G. R: N/A. Fitting Time: 3 Hrs. SKU: PH5366-HSV Brand: Pacemaker UPC. VY-VZ AWD Coupe 4, Avalanche and Avalanche XUV HSV 5.7 Litre Gen III. We will respond to you within 24 hours and do our best to help you out!