Kooks 3101H420 1-7/8x3 LT Headers Catted Mid Pipes 06-23 Charger/Challenger SR

Vehicle Fitment

• 2006-2023 Dodge Charger SRT8 (6.1L HEMI V8 2006-2010; 6.4L HEMI V8 / SRT 392 2011-2023, RWD)
• 2008-2023 Dodge Challenger SRT8 (6.1L HEMI V8 2008-2010; 6.4L HEMI V8 / SRT 392 2011-2023, RWD)
• 2006-2008 Dodge Magnum SRT8 (6.1L HEMI V8, RWD)
• 2006-2023 Chrysler 300C SRT8 (6.1L HEMI V8 2006-2010; 6.4L HEMI V8 2012-2023, RWD)

Fitment Notes

• Does NOT fit AWD (All-Wheel Drive) variants on any of the above platforms - RWD models only.
• Included standard high-flow catalytic converters are NOT rated for forced induction applications (supercharged or turbocharged engines). For boosted builds, Kooks GREENCAT connection pipes (3101H430) or off-road non-catted pipes (3101H410) are required instead.
• Mid pipes connect to the factory OEM exhaust using a 2-3/4" OEM-style outlet - compatible with stock and aftermarket cat-back exhaust systems using the OEM connection point.
• Mid pipes include an Exhaust Pressure Sensor (EPS) port to accommodate the factory exhaust pressure sensor. An EPS block-off plug is also included if the sensor is not being reinstalled.
• Not CARB compliant - not legal for street use or sale in California or other CARB-regulated states.
• Custom built to order - typical lead time is 6-8 weeks. Some orders may require up to 12 weeks.
• Custom tuning is strongly recommended after installation to optimize fuel trims, maximize power gains, and eliminate check engine lights from O2 sensor relocation.
• OEM D-port exhaust gaskets (Mopar #5038098AA / #5038099AA) are recommended at installation and sold separately.

Features

• 1-7/8" equal-length primary tubes with 3" fire-cone collectors - engineered to the 6.1L and 6.4L HEMI's firing order for maximum exhaust scavenging efficiency and consistent cylinder-to-cylinder flow balance.
• Fully matched D-port header flange - precision-fit to the 6.1L and 6.4L HEMI cylinder head exhaust port for a leak-free, zero-restriction seal at the head mating surface.
• Mandrel-bent T304 aircraft-grade stainless steel tubing - maintains consistent interior tube diameter through every bend, eliminating the turbulence and flow loss associated with crush-bent alternatives.
• Laser-cut 3/8" thick stainless steel header flanges - will not warp or distort under sustained high heat, with each port hand-ground to a smooth finish for zero exhaust constriction at the flange.
• Kooks scavenging spike in every collector - a proprietary design feature that creates a low-pressure zone at the collector exit to actively pull exhaust gases from the primary tubes, maximizing flow velocity at high RPM.
• Included 3" x 2-3/4" OEM-outlet catted stainless steel connection mid pipes - designed to connect directly to the factory or aftermarket cat-back exhaust at the stock 2-3/4" OEM connection point.
• Exhaust Pressure Sensor (EPS) port on mid pipes with EPS block-off plug included - ensures full compatibility with the LX/LC platform's factory exhaust pressure monitoring system.
• Deep, aggressive exhaust tone - long-tube design with high-flow cats delivers a substantially louder and deeper exhaust note versus OEM manifolds or shorty headers.
• Dyno tested and race proven - Kooks validates every header design on the dynamometer and in competition across NHRA, IHRA, NMCA, NMRA, NASCAR, and SCCA before production release.
• Handcrafted in the USA - individually built at Kooks' 45,000 sq. ft. ISO 9001:2015-certified facility in Statesville, NC, from T304 aircraft-quality stainless steel.
• Limited Lifetime Warranty against defects in materials and workmanship to the original purchaser.

Specifications

• Part Number: 3101H420
• Header Type: Long Tube (Factory Chassis), Headers + Connection Kit
• Primary Tube Diameter: 1-7/8" (1.875")
• Collector Diameter: 3"
• Mid Pipe Inlet Diameter: 3"
• Mid Pipe Outlet Diameter: 2-3/4" (OEM)
• Material: T304 Aircraft-Grade Stainless Steel
• Flange Type: D-Port, fully matched to 6.1L / 6.4L HEMI head
• Flange Construction: Laser-cut 3/8" thick stainless steel, hand-ground ports, TIG welded
• Tube Bending Method: Mandrel bent
• Catalytic Converters: Standard high-flow race cats (not for forced induction)
• EPS Port: Included on mid pipes (EPS block-off plug also included)
• CARB Status: Not CARB compliant - not legal for CA street use
• Build Type: Custom built to order - 6 to 12 week lead time
• Origin: Handcrafted in the USA (Statesville, NC)
• Certification: ISO 9001:2015 certified by NQA
• Warranty: Limited Lifetime Warranty (original purchaser)

Included Components

• 1x Pair Kooks 1-7/8" x 3" Long Tube Headers (Left and Right)
• 1x Pair 3" x 2-3/4" OEM-Outlet Catted Stainless Steel Connection Mid Pipes
• 1x O2 Sensor Extension Harness Kit
• 1x Exhaust Pressure Sensor (EPS) Block-Off Plug
• 1x Hardware Kit (header bolts, ball and socket bolts, gaskets)

Product Description

The Kooks 3101H420 is a complete long-tube header and catted mid-pipe kit built specifically for the 6.1L and 6.4L HEMI SRT8 and SRT 392 variants of the LX/LC platform - covering the 2006-2023 Dodge Charger SRT8, 2008-2023 Dodge Challenger SRT8, 2006-2008 Dodge Magnum SRT8, and 2006-2023 Chrysler 300C SRT8, all in rear-wheel-drive configuration only. AWD models on all platforms are excluded. The 3101H420 is the 1-7/8" primary tube version of Kooks' flagship SRT8/392 header kit, designed to significantly reduce backpressure and improve exhaust scavenging across the full RPM range of the high-displacement HEMI. The equal-length primary tube design is tuned to the 6.1L and 6.4L HEMI's firing order, ensuring balanced exhaust extraction from all eight cylinders for consistent power delivery and optimal scavenging efficiency - a meaningful upgrade over the OEM cast exhaust manifolds that are a well-documented restriction on these engines.

The kit's mid pipes connect to the factory OEM exhaust at the stock 2-3/4" outlet diameter, making them compatible with any factory or aftermarket cat-back system using the OEM connection point. The mid pipes include an Exhaust Pressure Sensor (EPS) port to accommodate the factory exhaust pressure monitoring sensor used on the LX/LC platform - an EPS block-off plug is also included for builds where the sensor is not being reinstalled. The included standard high-flow catalytic converters are rated for naturally aspirated applications; builds running a supercharger or turbocharger require the GREENCAT connection pipes (3101H430) or non-catted off-road mid pipes (3101H410) instead. It is important to note the mid pipe outlet diameter on this kit is 2-3/4" (not 2-1/2" as used on the companion 5.7L kit 3100H420) - confirm compatibility with your cat-back before ordering.

Every 3101H420 is handcrafted to order at Kooks' 45,000 sq. ft. ISO 9001:2015-certified facility in Statesville, NC, using T304 aircraft-quality stainless steel throughout, with typical lead times of 6-8 weeks. Laser-cut 3/8" thick stainless flanges are hand-ground at each port opening and TIG welded to mandrel-bent primary tubes, with Kooks' proprietary scavenging spike installed in every collector for maximum exhaust extraction at high RPM. The kit is backed by Kooks' Limited Lifetime Warranty to the original purchaser, and is not CARB compliant - it is not legal for street use or sale in California. Professional installation and a custom ECU tune are strongly recommended following fitment, along with a set of OEM D-port exhaust gaskets (Mopar #5038098AA / #5038099AA, sold separately).