Granatelli Motor Sports - 2.5" (63mm) Slip-Fit Electronic Exhaust Cutouts

The 2.5-inch slip-fit stainless steel electronic exhaust cutouts from Granatelli Motor Sports represent the most popular diameter choice for serious performance builds, delivering the ideal balance between unrestricted exhaust flow and versatile fitment across a wide range of street machines, muscle cars, and modified trucks. At the press of a rocker switch, the butterfly valve opens instantly to bypass the muffler and unleash the full, unfiltered sound of the engine, then closes just as quickly when a quieter exhaust note is needed for street driving or cruising through a neighborhood. The 2.5-inch sizing is particularly well-suited to high-horsepower applications where maximum exhaust scavenging matters, and the slip-fit design means installation requires no welding, no cutting of existing tubing, and no custom fabrication of any kind.

 

Every 2.5-inch slip-fit kit in this lineup is built from CNC-machined 6061 aircraft-grade aluminum, a material chosen specifically for its combination of lightweight strength and high-temperature resistance in a demanding underhood and underbody environment. Stainless steel butterfly plates and blade shafts provide the corrosion resistance needed for long-term durability, while the high-torque DC gear-reduction motor paired with high-temperature carbon steel gears ensures a complete, reliable open and close cycle every single time the switch is activated. The Smart Chip-controlled one-touch rocker switch is one of the most important engineering decisions in the Granatelli system, as it automatically stops the motor the moment the valve reaches its full open or full close position, eliminating the over-torque failure mode that damages the internal gears of competitor cutouts when a driver holds the activation switch too long.

 

The polished stainless steel turndowns included in each kit feature a 45-degree slanted discharge tip that directs exhaust flow downward and away from the vehicle, keeping fumes out of the cabin and giving the exit point a clean, finished appearance rather than a rough or improvised look. These turndowns mount via V-band clamps that rotate a full 360 degrees, allowing the installer to dial in the exact exit angle needed to clear the frame, suspension components, or any other underbody obstruction specific to the build. Each kit ships as a complete, ready to install system with the cutout unit, wiring harness, rocker switch, gaskets, band clamps, turndowns, and all necessary hardware included, and the entire Granatelli Motor Sports product line is backed by over 75 years of racing and product innovation, with expert support available by phone at 1-805-486-6644, Monday through Friday, 8 AM to 5 PM PST.