Granatelli 3" Vacuum/Pressure-Controlled Exhaust Cutout Kit, Stainless Steel Weld-In – 309630

Granatelli 3" Vacuum/Pressure-Controlled Exhaust Cutout Kit – Stainless Steel Weld-In

SKU: 309630

Open or close your exhaust from anywhere in the cab with the Granatelli 309630 vacuum/pressure-controlled exhaust cutout kit. A wireless remote signals the vacuum control box, and the included vacuum pump drives the cutout open or closed. Because the kit supplies its own vacuum, it doesn't depend on engine vacuum, so it works the same on boosted engines and big-cam builds.

Key Features

• Wireless remote control: Open or close the cutout from the driver's seat.
• Included vacuum pump: No engine vacuum required, so performance doesn't change with boost or cam choice.
• Vacuum control box, lines and fittings: Everything needed to plumb the system is in the kit.
• CNC-machined 6061 aluminum body: With a stainless steel butterfly plate and shaft.
• Polished 45° turndown with 360° V-band clamp: Rotate the exit to clear lines, the floor and tires.
• Weld-in installation: Welds into your exhaust for a permanent, leak-free joint.

Specifications

Sizing & Fitment

Measure the outside diameter of your exhaust pipe at the mounting point. If it measures 3", this kit is the right match. Running a true dual exhaust? Use one cutout per side, or choose the dual 309630K kit. Can't weld? The 309530 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. Route the vacuum lines away from the exhaust so heat can't damage them.

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

How is it controlled?
With a wireless remote that operates the vacuum control box, so you can open or close the cutout from the driver's seat.

Does it need engine vacuum?
No. The kit includes its own vacuum pump, so it works the same on boosted, big-cam and low-vacuum engines.

Vacuum or electric: which should I choose?
Both open and close from the cab. The vacuum kit uses a wireless remote and its own pump; the electric kit uses a motor on the cutout and a one-touch rocker switch. Compare the electric 307530 kit.

Can I install it myself?
Weld-in kits need welding equipment or a muffler shop. Prefer to clamp it on? The 309530 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 3 Inch Electric 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.