Flowmaster American Thunder Cat-Back Exhaust System: Jeep Grand Cherokee (12-15) / SRT (13-21)

Flowmaster American Thunder Cat-Back Exhaust System

2012–2021 Jeep Grand Cherokee / Jeep Grand Cherokee SRT 6.4L HEMI

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Overview:

The Flowmaster American Thunder Cat-Back Exhaust System is engineered specifically for Jeep Grand Cherokee models equipped with the 6.4-liter HEMI engine from 2012 through 2021, including the SRT variants from 2013 to 2021. Designed to enhance both performance and sound, this exhaust system delivers a balanced aggressive tone that complements the powerful V8 engine while improving exhaust flow for increased horsepower and torque. Ideal for Jeep enthusiasts seeking a durable, high-quality upgrade that combines style, sound, and performance.

With a focus on precision engineering and ease of installation, the American Thunder system offers a direct bolt-on fit using factory mounting points, making it a practical choice for those looking to upgrade their exhaust without extensive modifications.

Key Features:

This cat-back exhaust system incorporates advanced Flowmaster technology and premium materials to provide a superior driving experience. Key features include:

• Super 44 series mufflers for a distinctive, aggressive yet moderate exhaust note
• Tuned resonators to refine sound quality and reduce drone
• Mandrel-bent 3.00-inch 409 stainless steel tubing for optimal exhaust flow and durability
• Dual rear exit design for a sporty and aggressive appearance
• Large 4.00-inch polished stainless steel exhaust tips for a custom, high-end look
• Maximized rear-wheel horsepower gains of up to 6 hp and torque gains of 9 lb-ft over stock
• Complete hardware kit included for hassle-free installation
• Utilizes factory mounting locations to ensure a perfect fit and maintain vehicle integrity
• Backed by Flowmaster’s Lifetime Limited Warranty for long-term peace of mind

Construction & Design:

The American Thunder Cat-Back Exhaust System is crafted from premium 409 stainless steel, known for its excellent corrosion resistance and long-lasting durability. The mandrel-bent tubing maintains consistent diameter throughout bends, preventing flow restrictions and enhancing exhaust scavenging. The Super 44 mufflers are designed to deliver a deep, aggressive tone without excessive noise, striking a balance between performance and daily drivability.

Polished 4.00-inch stainless steel tips not only resist corrosion but also add a refined, aggressive aesthetic to the rear of the Jeep Grand Cherokee. The dual rear exit layout complements the vehicle’s muscular stance and performance character.

Performance & Sound

This exhaust system is engineered to improve exhaust flow, resulting in measurable performance gains. Dyno testing shows an increase of up to 6 horsepower and 9 lb-ft of torque at the rear wheels compared to the factory exhaust. The Super 44 mufflers combined with tuned resonators produce a bold, throaty exhaust note that enhances the driving experience without overwhelming cabin noise or drone during cruising.

Installation & Fitment:

The Flowmaster American Thunder Cat-Back Exhaust System is designed for a direct bolt-on installation on 2012–2021 Jeep Grand Cherokee models with the 6.4L HEMI engine, including SRT models from 2013 to 2021. It uses all factory mounting points and includes all necessary hardware, allowing for a straightforward installation process that typically requires no cutting or welding. This ensures a secure fit and preserves the vehicle’s factory integrity.

What's Included:

• Mandrel-bent 3.00-inch 409 stainless steel tubing
• Super 44 series mufflers
• Tuned resonators
• Dual 4.00-inch polished stainless steel exhaust tips
• Complete installation hardware kit
• Detailed installation instructions

Ideal For:

This exhaust system is perfect for Jeep Grand Cherokee owners who want to enhance their vehicle’s performance and sound without sacrificing daily drivability. It suits enthusiasts looking for a durable, high-quality exhaust upgrade that delivers a commanding exhaust note and noticeable power gains. Whether you drive a standard Grand Cherokee or the high-performance SRT model, the American Thunder Cat-Back exhaust offers a balanced upgrade that complements the vehicle’s aggressive character.