99-16 Chevrolet Silverado / GMC Sierra HD 3" Round Nerf Bars - Black AutoLEDTech.com this up-pipe supports both 38mm

this up-pipe supports both 38mm and 40mm external wastegates

you may need different reducer sizes

Perfect Fit: Designed specifically for Non 2JZ VVTi engines

The integrated straight elbow filler neck enhances cooling system functionality by allowing improved coolant filling and bleeding

99-16 Chevrolet Silverado / GMC Sierra HD 3" Round Nerf Bars - Black AutoLEDTech.com this up-pipe supports both 38mm3" Round Nerf Bars Black Steel tube construction delivers rugged side protection with a clean, functional look. The 3" round profile bolts to factory mounting points without drilling or welding. Black powder coat finish resists rust and weathering. Factory Mounting Points Ships from FL Warehouse In House Quality Check Key Features 3" round tube diameter Standard profile that matches OEM style protection without overhang. Powder coat black finish