FAQs: Jeep Wrangler JL4 Trail Rated Axle-Back Exhaust System
1. What's the difference between the Trail Rated (90R139) and other MRT Wrangler exhausts?
The Trail Rated system (Part #90R139) is specifically engineered for 2018+ Jeep Wrangler JL 4-door models and delivers refined performance sound with a loudness rating of 9/10. This system provides a spirited exhaust character that's more civilized than the King of the Hill system, making it ideal for owners who want enhanced sound without maximum loudness. The Trail Rated features dual 4-inch tips with polished or Black Ops finish options. For 2-door models, use Part #90R140, which is designed for the shorter wheelbase configuration. Both systems maintain tolerable drone levels (3/10) and deliver identical performance gains (8/10).
2. Will this exhaust fit my 2-door Wrangler JL?
No, the Trail Rated system (Part #90R139) is engineered exclusively for 4-door Wrangler JL models (2018+) equipped with the 3.6L V6 engine. The longer wheelbase and unique exhaust routing of 4-door models require different fitment specifications than 2-door models. For 2-door Wrangler JL models, MRT offers Part #90R140, which is specifically designed for the shorter wheelbase configuration and delivers similar performance characteristics and styling options. Using the correct part number ensures proper fitment, optimal acoustic performance, and prevents installation issues.
3. How does the sound compare to stock, and is there in cabin drone?
The Trail Rated exhaust delivers refined performance sound that's noticeably more spirited than the stock system while maintaining excellent daily drivability. At idle, you'll hear a confident presence with subtle performance character. During cruising, the exhaust maintains a civilized note without overwhelming the cabin. Under acceleration and at wide-open throttle, the system comes alive with spirited, fun performance sound. The drone rating of 3/10 indicates noticeable but tolerable cabin resonance during highway cruising, making it suitable for long-distance driving and daily commuting without fatigue.
4. Should I choose polished or Black Ops tips for my Wrangler?
The choice between polished stainless steel and Black Ops matte ceramic tips depends on your Wrangler's overall aesthetic and personal preference. Polished tips offer timeless, classic styling that complements any vehicle color and maintains a brilliant mirror-like shine with minimal maintenance. Black Ops tips create a tactical, aggressive appearance perfect for blacked-out builds, Rubicon models with black accents, or owners seeking a modern stealthy look. The Black Ops ceramic coating is extremely durable and resists heat discoloration better than painted finishes, maintaining its dark appearance through extreme temperatures. Both options feature identical T304 stainless steel construction with the same performance characteristics.
5. Can I install this exhaust myself or do I need a professional?
Yes, the Trail Rated exhaust system is designed for straightforward DIY installation and typically takes 60 minutes using common hand tools like wrenches, sockets, and jack stands. All necessary mounting hardware is included, and the system bolts directly to factory connection points without requiring welding or modifications. Most Jeep owners with basic mechanical skills can complete the installation in their garage or driveway following MRT's detailed installation instructions. However, if you prefer professional installation and are located near Plymouth, Michigan, MRT offers installation services at their facility by appointment. Call 734-455-5807 to schedule.
How does it sound? The MRT Wrangler Version 3 JL4 Axle-Back #90R139 has a refined on demand performance sound.
Is there drone or resonance? The drone is noticeable but tolerable.
What if I step on it? Wide-open throttle delivers a spirited and fun performance sound
