Granatelli Motor Sports
Granatelli 4" Electric Exhaust Cutout Kit, Stainless Steel Weld-In – 307540
Granatelli 4" Electric Exhaust Cutout Kit, Stainless Steel Weld-In – 307540
SKU:307540
In Stock—More than 10 available
Prequalify Now
Search By Year,Make and Model
Granatelli Motor Sports 4.0″ Electronic Exhaust Cutout Kit – Universal Weld-In for Performance Builds
SKU: 307540
Experience Ultimate Exhaust Control with Granatelli’s 4.0″ Electronic Exhaust Cutout Kit. Designed for serious performance enthusiasts, this universal weld-in kit delivers unmatched power, flow, and adjustability. Ideal for turbocharged, supercharged, or large displacement engines, the Granatelli 307540 cutout system lets you switch between aggressive open exhaust and quiet in seconds—no tools or tuning required.
4-Inch Electronic Exhaust Cutout Kit Key Features
- Massive 4″ Cutout: A large 102 mm stainless valve provides maximum flow, ideal for turbocharged, supercharged, or big displacement engines.
- Smart‑Chip “One‑Touch” Control: Quick rocker switch toggles valve fully open or closed automatically—no switch holding required, preventing motor burnout.
- Rugged Motor Assembly: High‑torque DC gear reduction motor with heat‑resistant carbon‑steel gears ensures reliable full-open/full-close cycles every time.
- Premium CNC Construction: Durability meets precision with 6061‑T6 aluminum motor housing and 304 stainless steel shafts and plates.
- Polished 45° Rotating Tip: The angled turndown tip not only looks sharp but can be adjusted 360° via V‑band clamps for perfect fitment.
- All‑Weather Durability: Fully sealed internals protect against water, dirt, and corrosion.
- Complete Weld‑In Kit: Includes Y‑pipe, wiring harness, rocker switch, gaskets, clamps, and hardware—everything needed for pro‑grade installation.
Why You’ll Love It
- Unmatched Sound Versatility: Cruise quietly or unleash aggression—instant sound control tailored to your mood and environment.
- Optimized for Power: Maximizes exhaust flow on demand, reducing backpressure for enhanced horsepower and torque.
- Built for Heavy Duty Use: Made to withstand race-day abuse, heat, and grime while maintaining flawless operation.
- Stylish & Functional: The polished turndown isn’t just for looks—it’s adjustable to fit any custom exhaust layout.
Tech Snapshot
| Specification | Detail |
|---|---|
| Cutout Diameter | 4.0″ (102 mm) |
| Materials | 304 Stainless Steel, 6061‑T6 Aluminum |
| Valve Operation | DC Gear Motor with Smart-Chip protection |
| Tip Angle | 45° polished stainless, 360° adjustable |
| Fitment | Weld-In; universal (Y-pipe included) |
| Hardware Included | Switch, wiring, gaskets, clamps |
Ideal For
- Muscle cars, hot rods, and race builds need serious flow and control
- Turbocharged or supercharged setups seeking explosive mid-range and top-end power
- Show cars where control over the exhaust note is essential
- Enthusiasts who value a toolbox-ready install kit with premium hardware
The Granatelli 307540 Electronic Exhaust Cutout Kit brings together brute strength, smooth performance, and on-demand sound control in one slick package. If you crave that thunderous tone—yet need the ability to dial it back—this kit offers the perfect balance of intimidation and finesse.
Sizing & Fitment
Measure the outside diameter of your exhaust pipe at the mounting point. If it measures 4", this kit is the right match. Running a true dual exhaust? Use one cutout per side, or choose the dual 307540K kit. Can't weld? The 302540 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 302540 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.
