Granatelli Motor Sports - 2.25" (57mm) Slip Fit Electronic Exhaust Cutouts

The 2.25-inch slip-fit stainless steel electronic exhaust cutouts from Granatelli Motor Sports give performance enthusiasts complete on-demand control over their exhaust sound and flow without crawling under the vehicle or making permanent modifications to the exhaust system. At the flip of a rocker switch, the butterfly valve opens to bypass the muffler entirely, delivering the full, unfiltered exhaust note the engine was always capable of producing, then closes again just as quickly for quiet, street-friendly cruising. The 2.25 inch diameter is a practical and popular choice for high-performance builds, as the cutout body measures just 2.25 inches tall, allowing it to work with any 2.25-inch or larger round tube exhaust system while actually picking up clearance compared to a standard 3-inch tube.

 

Every kit in this category is built around a CNC-machined 6061 aircraft-grade aluminum body that is engineered to withstand the intense heat and mechanical stress of a performance exhaust environment. Internal stainless steel butterfly plates and blade shafts resist corrosion and handle repeated cycling without degradation, while the high-torque DC gear-reduction motor and high-temperature carbon steel gears ensure a solid, complete open and close operation every time. A key differentiator in the Granatelli system is the Smart Chip-controlled one-touch rocker switch, which automatically stops the motor once the valve reaches full open or full close position, eliminating the risk of over-torquing the butterfly and damaging the internal gears, which is a known weakness of competitor systems that require the driver to hold the switch.

 

The slip-fit installation style is designed to clamp onto existing exhaust tubing using band clamps, making these units compatible with a wide range of exhaust configurations without requiring welding or custom fabrication. Polished stainless steel turndowns with a 45-degree slanted tip are included in every kit and mount via V-band clamps that rotate a full 360 degrees, allowing the installer to direct exhaust flow precisely downward or at any angle needed to suit the specific application and chassis clearance requirements. Each kit ships as a complete, ready-to-install system including the cutout unit, wiring harness, rocker switch, gaskets, band clamps, and all necessary hardware, and Granatelli Motor Sports backs the product with over 75 years of racing and product innovation expertise, available by phone at 1-805-486-6644, Monday through Friday, 8 AM to 5 PM PST.