HD Belt Tensioner for Magnuson Supercharger – Fits GTO, Trailblazer SS, Silverado, Sierra

Description Heavy Duty Supercharger Belt Tensioner for Magnuson Superchargers – Upgrade for High Boost Performance Upgrade your Magnuson supercharger system with this Heavy Duty HD Belt Tensioner, engineered to handle high boost levels and eliminate belt slip. This upgraded tensioner is a direct-fit replacement for Magnuson part number 31-12-00-082 (also known as M-31-12-00-082) and is a critical reliability upgrade when running over 8 PSI of boost. While the stock tensioner works fine at lower boost (7–8 PSI), it often fails to maintain proper tension under higher loads. When you’re running 10–15 PSI with a smaller supercharger pulley, belt slip and fatigue are common—leading to power loss and even belt failure. This upgraded tensioner solves that. Key Features: Heavy Duty Spring & Arm Assembly – Handles increased belt tension from higher boost levels. 8-Rib Pulley Design – Maximizes belt grip and reduces slippage. Direct Fit Replacement – No modifications needed; same dimensions as OEM Magnuson unit. Built for Boost – Ideal for high-performance builds and daily-driven supercharged vehicles. Compatible With Magnuson Supercharged Vehicles: Pontiac GTO (2004, 2005, 2006) Chevrolet Silverado (2003–2007 Classic) GMC Sierra (2003–2007 Classic) Chevrolet Trailblazer SS (2006, 2007, 2008, 2009) Chevrolet SSR Whether you’re drag racing, street driving, or just looking for better reliability from your supercharged setup, this HD Magnuson supercharger belt tensioner is the upgrade your build needs. Fast Shipping: Just $19.50 via FedEx 2-Day