Granatelli Dual 4" Electric Exhaust Cutout Kit, Stainless Steel Weld-In – 307540K

Dominate the Road—4″ Dual Cutout Command

SKU: 307540K

Take control of your sound and flow with the Granatelli Dual 4.0″ Stainless Steel Electronic Exhaust Cutout Kit. With two massive 4″ valves, CNC-machined components, and polished stainless turndowns, you get instant access to raw power and authority—while enjoying quiet cruising when desired.

Electronic Exhaust Cutout Kit Key Features:

• Heavy-Duty Build: CNC-machined 6061 aluminum motor bodies paired with rugged stainless steel cutouts and shafts
• Smart-Chip One‑Touch Control: Flip the rocker once—motors auto-stop at full open/close to protect internal gears
• 360° Adjustable Turndowns: Polished 45° stainless exits rotate via V-band clamps for perfect alignment
• High-Torque Performance: DC gear‑reduction motors with heat-resistant carbon steel gears ensure full-cycle reliability
• Fully Sealed Durability: Internal and external components are sealed for weather resistance and long life
• Complete Weld‑In Kit: Includes dual cutouts, Y-pipes, switches, wiring, gaskets, clamps, hardware—ready to install

Specs Snapshot

• Cutout Diameter: 4.0″ (102 mm)
• Material: Stainless steel cutouts & turndowns; CNC 6061 aluminum motor bodies
• Exhaust Tip: Polished stainless, 45° angle, 360° adjustable
• Motor: High-torque DC with carbon steel gears and Smart-Chip auto-stop
• Fitment: Universal weld-in dual kit (Y-pipe included)
• Included: All hardware, gaskets, wiring harnesses, rocker switches

Built for Power, Designed for Control

Whether you're ripping down the quarter mile or cruising to a car show, this 4″ dual cutout delivers booming performance on demand and stealth on standby. Rugged, refined, and fully equipped—this is your exhaust’s next big upgrade.

Sizing & Fitment

Measure the outside diameter of your exhaust pipe at the mounting point. If it measures 4", this kit is the right match. This dual kit is for true dual exhaust systems, one cutout per side. Single exhaust? Choose the single 307540 kit. Can't weld? The 302540K slip-fit version installs with clamps.

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?
Weld-in kits need welding equipment or a muffler shop. Prefer to bolt it on? The 302540K is a slip-fit version.

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 4 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.