Kooks GE-90147 3 in. GREENCATS Catalytic Converter 7 in. Long EPA Certified Universal

Compact 3 Inch EPA Certified GreenCats Converter for Performance Street Builds

The GE-90147 is a universal 3 inch GreenCats catalytic converter with a 7 inch body length, combining EPA certified emissions compliance with the high output substrate technology Kooks developed for performance exhaust applications. At 3 inches in and out with a 7 inch body, the GE-90147 is shorter and easier to package than traditional high flow cats, making it a practical choice for builders working with limited routing space in engine bays, X pipes, or mid pipe configurations. The T304 stainless steel body is built to handle the thermal cycling demands of a performance exhaust system.

The GreenCats substrate inside this converter is formulated to flow at levels appropriate for modified engines while still meeting EPA standards for 49 state street certification. Platinum coated construction ensures fast catalyst light off even at lower exhaust temperatures, and furnace brazed end caps keep the converter sealed under pressure. Kooks builds this converter to the same quality standards as the GreenCats units bundled with their vehicle specific header kits, so you get the same technology in a standalone form for custom fabrication work or direct replacement duty.

Key Features

• Universal 3 inch inlet and outlet for 3 inch exhaust system compatibility
• Compact 7 inch body length for tight routing situations
• EPA certified for 49 state street use
• High output GreenCats substrate for performance flow
• T304 stainless steel body
• Platinum coated substrate for rapid catalyst activation
• Furnace brazed end caps for a sealed, durable assembly
• Not CARB certified; not for sale or installation in California

What's Included

• 1 x universal 3 inch GreenCats catalytic converter with 7 inch body

Specifications

Frequently Asked Questions

What size exhaust pipe does this converter fit?
This converter has a 3 inch inlet and 3 inch outlet, designed for installation into 3 inch exhaust tubing via weld on connections.

Is this converter EPA certified?
Yes. This converter carries EPA certification for 49 state street use. It is not CARB certified and may not be sold or installed in California.

How is this converter installed?
This converter is a universal weld in converter. It must be cut into the exhaust system by welding the inlet and outlet connections to the surrounding 3 inch exhaust tubing.

Is the GreenCats substrate adequate for modified engines?
Yes. The GreenCats substrate is a high output formulation engineered to handle elevated exhaust temperatures and higher flow rates from modified naturally aspirated and forced induction engines.

Can I use two converters on a dual exhaust V8?
Yes. For a dual exhaust application, you would install one per side. Each is sold individually.

What is the converter body made from?
The body is T304 stainless steel with furnace brazed end caps, providing long term durability and resistance to rust and thermal fatigue.

Will I need a tune after installing this converter?
If this converter is being used as part of a full performance exhaust system that includes long tube headers, a professional tune is recommended. On stock exhaust configurations, a tune is typically not required solely for the cat replacement.

Is this the same substrate technology used in Kooks header kits?
Yes. The GreenCats substrate in this converter is the same technology Kooks includes in their bundled catted connection pipe kits, available here in standalone universal form.

Does flow direction matter during installation?
Yes. Install this converter with the inlet end toward the engine and the outlet end toward the tailpipe to ensure proper catalytic function.

Installation Instructions

This converter is a universal weld in catalytic converter. Follow these general steps:

1. Let the exhaust system cool completely before beginning.
2. Determine the installation location, noting the 7 inch body length plus allowance for weld joints.
3. Mark and cut the exhaust tubing at the inlet and outlet positions.
4. Insert the converter with the inlet toward the engine.
5. Verify clearance to the vehicle floor, frame, and adjacent components.
6. Tack weld to confirm alignment before completing full circumference welds at both ends.
7. Use T304 compatible filler material for clean, leak free weld joints.
8. Inspect completed welds before starting the engine.

Prop 65 Warning

WARNING: This product can expose you to chemicals including Chromium and Nickel, which are known to the State of California to cause cancer, birth defects or reproductive harm. For more information go to www.P65Warnings.ca.gov.