-9%
Click to zoom in
SKU: 28603200 | UPC: 842422151744
Kooks 3" GREEN Catted Connection Pipes for 2015–2020 Chevrolet Silverado 1500 & GMC Sierra 1500 5.3L
The Kooks 28603200 3-inch GREEN catted connection pipes complete the exhaust upgrade on 2015–2020 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks with the 5.3L V8, linking Kooks long tube headers directly to the factory mid-pipe for seamless integration that maintains 49-state emissions compliance while adding 20–30 rear-wheel horsepower and 25–35 lb-ft of torque through high-flow 300-cell metallic substrate GREEN catalytic converters and mandrel-bent tubing.
Handcrafted from T304 aircraft-quality stainless steel with 3/8-inch laser-cut flanges and full TIG welds, these pipes ensure zero leaks under extreme heat and support over 700 HP from tunes or cams without sacrificing ground clearance or daily drivability. The direct bolt-on design preserves the truck's refined V8 soundtrack with a deeper, more aggressive tone at wide-open throttle and zero drone at cruise.
For Silverado and Sierra 5.3L owners pairing Kooks headers with stock exhaust, the 28603200 GREEN catted connection pipes are the essential emissions-legal link that maximizes performance with work-truck reliability.
Key Features
- 3-inch mandrel-bent T304 stainless steel tubing
- GREEN 300-cell high-flow metallic catalytic converters
- Direct bolt-on to Kooks headers and OEM mid-pipe
- 3/8-inch laser-cut flanges with full TIG welds
- Supports 700+ HP with proper tuning
- Preserves factory ground clearance and heat shielding
Product Notes
- 49-state EPA compliant not for sale or use in California or CARB states without exemption
- Requires Kooks long tube headers for proper fitment
- Includes all hardware and gaskets
California Proposition 65: Contains chemicals known to the State of California to cause cancer or reproductive harm.
Warranty: Limited lifetime on stainless construction and 25,000 miles on catalytic converters to original purchaser.
Installation Notes
- Professional installation recommended lift required
- Bolt pipes to Kooks header collectors with supplied gaskets
- Connect to OEM mid-pipe using included hardware
- Torque flanges to 25-30 ft-lbs and check for leaks after heat cycle
This Part Fits
| Year | Make | Model | Submodel/Engine |
|---|---|---|---|
| 2015–2020 | Chevrolet | Silverado 1500 | WT, LT, RST, LTZ, High Country - 5.3L V8 |
| 2015–2020 | GMC | Sierra 1500 | Base, SLE, SLT, Denali - 5.3L V8 |
Note: Fits all cab styles and drivetrains with Kooks long tube headers and 5.3L V8. Excludes 6.2L or diesel models.
What's Included in the Purchase
- (2) 3" GREEN Catted Connection Pipes
- Gaskets and Flange Hardware Kit
- Detailed Installation Instructions
- Part Number: Kooks 28603200
Why Choose Kooks?
- Over 60 years of championship-winning exhaust engineering
- Handcrafted in the USA from T304 aircraft-quality stainless steel
- Limited lifetime warranty and dyno-proven performance
Frequently Asked Questions
-
Q: Does this work with factory headers?
A: No, designed specifically for Kooks long tube headers -
Q: Is it emissions legal?
A: Yes, 49-state EPA compliant with GREEN cats -
Q: How much power does it add?
A: 20–30 RWHP when paired with Kooks headers
Shipping & Handling
- Method: UPS or Fed Ex Ground.
- Availability: Typically ships same day or next if in stock.
- Packaging: Heavy-duty wooden crate with foam protection.
Read More
Exhaust Systems
Find the right performance exhaust system for your car, truck, or SUV with our curated selection of stainless-steel upgrades engineered for power, sound, and reliability. Browse proven layouts like cat-back, axle-back, and turbo-back systems, dial in flow with headers & manifolds and downpipes, or tailor your tone with mufflers & resonators and polished exhaust tips. We also stock emissions-minded solutions including direct-fit catalytic converters and universal catalytic converters. Shop top brands such as Akrapovič, AWE Tuning, Borla, Invidia, GReddy, Perrin, Banks Power, and Gibson. Every option is selected for quality construction (think mandrel-bent tubing and precise welds) and bolt-on fitment, and our Year/Make/Model search makes it easy to match parts to your build—upgrade throttle response, unlock a deeper, refined exhaust note, and enhance your vehicle’s style with components that deliver performance you can feel. View Our Exhaust Systems Products...