Granatelli 3.5" Electric Exhaust Cutout Kit, Stainless Steel Slip-Fit – 302535

Granatelli Stainless Steel 3.5 Inch Electronic Exhaust Cutout Kit

SKU: 302535

Dominate the Drive—Uncork the Power

Elevate your ride from discreet to dominant with the 3.50″ (89 mm) Granatelli electronic cutout. Whether you're sneaking through town or laying down burnout tracks, this all-in-one kit gives you total control over exhaust tone and flow with the flip of a switch. Lightweight, strong, and full of attitude. Ready when you are.

Elite Build Quality

• CNC-machined 6061 aircraft-grade aluminum body—built to withstand intense heat and abuse
• Stainless-steel butterfly plates & shafts for corrosion resistance and longevity
• High-temp carbon-steel gears with gear-reduction motors for dependable, full-cycle operation

Smart, One-Touch Control

• Smart-Chip controlled rocker switch—no holding required
• Auto-stop function prevents motor overrun for long-term reliability

Custom Fit & Style

• 3.50″ diameter is ideal for high-horsepower builds
• Polished stainless-steel, 45° slanted turndown for style and performance
• 360° V-band clamp rotation lets you position exits perfectly

Full Installation Kit

• Includes hardware, gaskets, wiring harness, rocker switch, and slip-on band clamp
• Clamp-on design fits universally for DIY or pro installs

Built for Extremes

With its 3.50″ flow path, heavy-duty components, and polished finish, this kit is purpose-built for ultra-high-horsepower engines, race cars, and bold street builds. It’s the ultimate choice for drivers who demand performance, durability, and sound on their terms.

Set the Tone—Your Way

Quiet cruising or loud presence—the choice is yours. This Granatelli cutout puts that power in your hands. No more compromises. Just pure, unfiltered control over your exhaust experience.

Sizing & Fitment

Measure the outside diameter of your exhaust pipe at the mounting point. If it measures 3.5", this kit is the right match. Running a true dual exhaust? Use one cutout per side, or choose the dual 302535D kit.

Where to Mount It

Mount the cutout at least 18 to 24 inches after the catalytic converters, and away from any O2 sensor. Aim the turndown toward the rocker panel, away from fuel and brake lines. For the best sound, mount it after the X-pipe or H-pipe.

Legal Note

Many states, including California, prohibit exhaust cutouts on vehicles driven on public roads. Keep the cutout closed on the street and open it only at sanctioned off-highway events. Never install a cutout upstream of a catalytic converter.

Frequently Asked Questions

Do I have to hold the switch?
No. The Smart-Chip one-touch rocker completes the valve's travel with one tap.

Can I install it myself?
Yes. This kit clamps onto the pipe, so most installs need only basic hand tools and a way to cut the pipe.

What's the warranty?
90 days, with optional 1-, 2- or 3-year extended coverage available at checkout.

Will it add horsepower?
Opening the cutout reduces backpressure. Gains depend on your engine, headers and tune.

New to cutouts? Read our 3.5 Inch Exhaust Cutout Guide for choosing the right size and type, mounting and state laws.

Why Choose Granatelli Motor Sports?

Granatelli Motor Sports develops performance components for real-world street, street/strip, race, and custom applications, with an emphasis on practical performance, dependable construction, and integration into serious automotive builds.