Kooks 98-02 Chevrolet Camaro Z28 SS/Pontiac Firebird Trans Am 1-7/8 x 3 Header & Catted Y-Pipe Kit

Maximize Every Horsepower from Your LS1 Fourth-Gen F-Body with a Complete 1-7/8 Inch Long Tube Header and Catted Y-Pipe System

The Kooks 2241H420 is a complete 1-7/8 inch x 3 inch long tube header and catted Y-pipe kit built for the 1998 through 2002 Chevrolet Camaro Z28 and SS with the LS1 5.7L V8 and the 1998 through 2002 Pontiac Firebird Trans Am with the LS1 5.7L V8. MPN 2241H420 replaces the restrictive factory exhaust manifolds with equal-length T304 stainless long tube headers and connects to a 3 inch x 2-3/4 inch stainless catted Y-pipe that mates to the factory OEM connection point without cutting or modification. The 2241H420 is built to order at Kooks' USA manufacturing facility using 16-gauge T304 stainless steel, 3/8 inch laser-cut flanges, and full TIG welds throughout the system, delivering the tube geometry and scavenging efficiency that fourth-generation F-body LS1 owners demand for track days, autocross, and full-throttle street performance.

The Kooks 2241H420 uses standard high-flow catalytic converters in the Y-pipe, making it a catted off-road performance system rather than the GREEN cat version. This system is NOT CARB approved and is not legal for use on registered vehicles in California or other CARB-regulated states. For a 49-state street-legal alternative, refer to the 2241H410 or ask about the GREEN cat version. All purchasers are responsible for confirming local and state emissions regulations before installation. Kooks backs the 2241H420 with a limited lifetime warranty on all stainless steel components and a 25,000-mile warranty on the catalytic converters.

Key Features

• 1-7/8 Inch Equal-Length Primary Tubes: Mandrel-bent T304 stainless primaries deliver balanced exhaust flow across all eight cylinders for broad torque gains on the LS1 F-body.
• 3 Inch x 2-3/4 Inch Catted Stainless Y-Pipe: High-flow cats in the stainless Y-pipe deliver improved mid-range and top-end power while connecting to the factory OEM outlet point.
• Direct OEM Connection Fitment: The Y-pipe mates to the factory 1998 through 2002 Camaro and Firebird OEM connection point, keeping the installation straightforward and reversible.
• 3/8 Inch Laser-Cut Flanges: Precision flanges eliminate gasket blowout and maintain a leak-free seal at the cylinder head through repeated heat cycles.
• 16-Gauge T304 Stainless Steel: Aircraft-quality stainless with full TIG welds resists corrosion and handles sustained exhaust temperatures above 1,500 degrees F.
• Stage 8 Locking Bolts Included: Anti-loosening fasteners prevent header bolts from backing out under the vibration of performance driving.
• O2 Sensor Extensions Included: Proper sensor positioning is maintained without relocating bungs or triggering check engine lights under normal use.
• Handcrafted in the USA: Every 2241H420 is built to order at Kooks' American facility with race-proven inspection standards.

What's Included

• 2 x 1-7/8 inch x 3 inch Long Tube T304 Stainless Steel Headers with Merged Collectors
• 3 inch x 2-3/4 inch Catted Stainless Steel Y-Pipe with High-Flow Catalytic Converters
• Stage 8 Locking Header Bolts and Mounting Hardware
• Exhaust Gaskets
• O2 Sensor Extensions and Retainers
• Clamps
• Installation Instructions with Torque Specifications

Product Specifications

This Part Fits

Frequently Asked Questions

Q: Will the Kooks 2241H420 fit both the Camaro and the Firebird with the LS1?
A: Yes. The 2241H420 is designed to fit the 1998 through 2002 Chevrolet Camaro Z28 and SS as well as the 1998 through 2002 Pontiac Firebird Trans Am, all sharing the LS1 5.7L V8. Both platforms share the same engine and underbody geometry that Kooks engineers the 2241H420 around.

Q: What is the difference between the Kooks 2241H420 and the 2241H430?
A: The 2241H430 uses Kooks Ultra-Green high-efficiency catalytic converters and is the 49-state EPA compliant GREEN cat version. The 2241H420 uses standard high-flow cats for off-road and performance use. Neither version is CARB approved for California registration.

Q: Does the Y-pipe on the 2241H420 bolt to the factory Camaro catback?
A: The 2241H420 Y-pipe connects to the factory OEM connection point on the 1998 through 2002 F-body, allowing the factory or an aftermarket catback to bolt on without modification. Confirm the outlet diameter of your catback before ordering to ensure compatibility.

Q: Do I need a tune after installing the Kooks 2241H420?
A: A tune is not required to run the vehicle, but a professional ECU calibration is strongly recommended to take full advantage of the improved exhaust flow, correct air-fuel ratios, and advance timing for maximum power on your LS1 Camaro or Firebird.

Q: Is the Kooks 2241H420 legal for street use in my state?
A: The 2241H420 is not CARB approved and is not legal in California. In other states, emission regulations vary. The buyer is responsible for confirming local and state emission rules before installation. This kit is NOT legal for use on any California emission-registered vehicle.

Q: How much power can I expect from the 2241H420 on a stock LS1 Camaro or Firebird?
A: Documented dyno results on stock and lightly modified 1998 through 2002 LS1 F-body applications typically show gains of 20 to 40 rear-wheel horsepower and 15 to 30 lb-ft of torque over the factory exhaust manifolds. A professional tune increases these gains substantially.

Q: How long is the lead time for the Kooks 2241H420?
A: Every 2241H420 is built to order at Kooks' American manufacturing facility. Standard lead time is 4 to 6 weeks. Orders placed during peak demand periods may take up to 8 weeks. Contact us before ordering if you have a firm event or competition date.

Q: Does the 2241H420 include all the hardware I need for installation?
A: Yes. The kit ships complete with Stage 8 locking header bolts, exhaust gaskets, O2 sensor extensions, clamps, and a full installation manual with torque specifications. No additional hardware purchases are required for a standard installation on a 1998 through 2002 LS1 F-body.

Q: Will the Kooks 2241H420 clear the factory crossmember and steering components on my fourth-gen Camaro?
A: Kooks designs the 2241H420 tube routing to clear the factory crossmember, steering shaft, and suspension components on stock-ride-height 1998 through 2002 F-body applications. Vehicles with engine swaps, lowering kits, or non-stock suspension components may require clearance verification before installation.

Prop 65 Warning

California Proposition 65 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 other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Installation Instructions

1. Raise the vehicle on a lift or secure jack stands and allow the factory exhaust to cool completely before starting disassembly.
2. Disconnect the negative battery terminal to prevent accidental PCM or O2 sensor damage during removal.
3. Unbolt and remove the factory exhaust manifolds, disconnecting the upstream and downstream O2 sensors. Remove the OEM Y-pipe and catalytic converter assembly.
4. Clean the cylinder head exhaust port surfaces and inspect for cracks or warping before installing new gaskets.
5. Place the supplied exhaust gaskets onto the cylinder head ports and position the Kooks 2241H420 long tube headers. Hand-thread the Stage 8 locking bolts to verify alignment before torquing.
6. Torque the header flange bolts in a cross pattern to the specification listed in the Kooks installation manual, typically 18 to 22 ft-lb for LS1 applications.
7. Install the 3 inch x 2-3/4 inch catted Y-pipe, connecting the Y-pipe inlet flanges to the header collectors and the Y-pipe outlet to the factory OEM connection point. Tighten all clamps evenly.
8. Route and connect the included O2 sensor extensions to the existing O2 sensor connectors, then thread the sensors into the new Y-pipe bungs and torque to spec.
9. Reconnect the negative battery terminal, start the engine, and inspect all flanges and clamp connections for exhaust leaks with the engine warm. Retorque fasteners after the first heat cycle.
10. A professional ECU calibration is strongly recommended to maximize power output and optimize air-fuel ratios for the improved exhaust flow on your LS1 F-body.