aFe MACH Force-Xp Cat-Back — Jeep Grand Cherokee 3.6L, Single Exhaust

MACH Force-Xp 304 stainless cat-back for factory single-exhaust Grand Cherokee 3.6L

The aFe 49-38078-B MACH Force-Xp cat-back uses 2.5-inch to 3-inch mandrel-bent 304 stainless tubing, two resonators in the front Y-pipe assembly and one high-flow muffler finished in black high-temperature metallic powder coating. One black 4.5-inch 304 stainless tip completes the single exit. The exact manufacturer limits this system to factory single-exhaust vehicles; a model year or trim name alone does not establish compatibility.

Key Features

• Selected aFe part 49-38078-B.
• Factory SINGLE EXHAUST ONLY, within documented Grand Cherokee 2014–2021 gas V6 3.6L applications. Factory dual-exhaust configurations are excluded.
• 2.5-inch to 3-inch mandrel-bent 304 stainless tubing with a dual-resonated front Y-pipe and one high-flow muffler.
• High-temperature metallic black powder-coated muffler; one black 4.5-inch angled double-wall 304 stainless tip with laser-etched aFe logo.
• Selected installation uses the factory isolation mounts plus the supplied isolation mount, fasteners and three separately listed 3-inch bands.
• Manufacturer designed the system for a powerful sound and reduced highway resonance; zero drone is not guaranteed for every vehicle.
• 2021 Overland, Summit, Trailhawk and High Altitude have documented factory dual exhaust and are excluded despite the broader secondary named table. Earlier legacy entries for those names remain unverified for exhaust configuration.

Fitment

The current exact manufacturer lists Grand Cherokee 2014–2021 gas V6 3.6L, with the explicit factory SINGLE EXHAUST ONLY restriction. The selected named table is secondary evidence, not approval of factory dual-exhaust trims. Full manufacturer-authored 2021 fleet and order-guide tables establish dual exhaust on Overland, Summit, Trailhawk and High Altitude, so 2021 is removed from those four existing scopes. Their earlier legacy years are retained as UNVERIFIED for factory-exhaust configuration and require aFe confirmation before purchase or installation. Limited 2021 is restored using the exact named table and OEM V6 single-exhaust specification. No new Limited X, 80th Anniversary or Upland mapping is established, and no broader 2014–2020 Limited approval is inferred.

Specifications

What's Included

• The 49-38078-B kit includes one dual-resonated Y-pipe assembly 05-145554, one mid-pipe 05-145555, one muffler assembly 05-145556 and one tailpipe 05-145557.
• One selected black tip 49T30454-B092; the polished alternative is not also supplied.
• Three 3-inch bands 05-41055, one isolation mount 05-46050, four screws 03-50209 and four nuts 03-50208.
• Reuse the original isolation mounts as directed. No catalytic converters, sensors, intake filter or intake coupling are established as supplied.

About aFe Power

aFe Power develops application-specific intake, filtration, exhaust, cooling, tuning, suspension, drivetrain, and truck-performance components supported by product testing and documented installation requirements.

Related Parts

• Exact selected system, single-exhaust restriction and current applications
• Complete selected eight-step installation guide and diagram
• Exact selected 2017 Grand Cherokee V6 dyno chart
• Complete exact named secondary application table; factory-exhaust qualification still required
• Manufacturer-authored 2021 fleet guide; Grand Cherokee exhaust equipment table
• Manufacturer-authored 2021 order guide; exact model and package exhaust equipment
• Shop cat-back exhaust systems
• Shop aFe Power

FAQ

It is a 304 stainless cat-back with two front resonators, one high-flow muffler and one black 4.5-inch tip for documented Grand Cherokee gas V6 3.6L applications with FACTORY SINGLE EXHAUST ONLY.

No. The exact manufacturer expressly limits this selection to factory single exhaust. Do not use a broad year, engine or retailer trim listing to approve a factory dual-exhaust vehicle.

Full manufacturer-authored 2021 tables establish factory dual exhaust for Overland, Summit, Trailhawk and High Altitude. Those 2021 entries are excluded. Their earlier retained legacy years remain unverified for exhaust configuration and need aFe confirmation before purchase or installation.

No. The added Limited scope is 2021 gas V6 3.6L with factory single exhaust, supported by the exact secondary table and OEM single-exhaust specification. No 5.7L engine or earlier Limited-year approval is inferred.

The front Y-pipe assembly has two resonators. There is one high-flow muffler and one black 4.5-inch double-wall angled 304 stainless tip. This is a single-exit system, with no second polished alternative tip included.

No. The exact 2017 V6 chart shows same-point differences of 5.2 hp and 7.6 lb-ft at displayed x3.609, which round to the primary claims. Differences between separate power and torque maxima are 5.1 hp and 6.3 lb-ft at different RPM. The test used 265/40R22 wheels/tires and does not guarantee every vehicle’s result.

Leave the system loose until all components are installed. Support the muffler separately, use the factory isolation mounts and supplied hardware, then align the complete system before final tightening.

The selected one-page guide gives no numerical torque, fixed clearance or cutting instruction. Recheck and re-tighten the exhaust after 50–100 miles. Do not borrow ground-strap, battery, sensor, spare-removal or cutting procedures from a different Grand Cherokee system.

Installation Instructions

1. Confirm aFe 49-38078-B against the exact vehicle and installed equipment. Inventory the actual components and follow the selected manufacturer instructions and current vehicle service requirements.
2. Confirm the exact gas V6 3.6L vehicle has FACTORY SINGLE EXHAUST. Do not install on factory dual exhaust or treat the unverified legacy rows as cleared fitment. Resolve any configuration question with aFe before purchase or disassembly.
3. Read the complete selected eight-step guide. Let the exhaust cool, use protective equipment and safely support the vehicle and exhaust. Leave the new system loose until all components are installed.
4. Remove the factory exhaust up to the first flanged joints, retaining the original isolation mounts. No selected cutting, battery, sensor or exhaust-ground-strap operation is printed.
5. Install the front dual-resonated Y-pipe using the supplied hardware and original isolation mounts.
6. Install the mid-pipe with a supplied 3-inch band and original isolation mounts. Install the muffler with the supplied bands, supporting the muffler with a separate stand.
7. Install the tailpipe and selected black tip with the supplied attachment arrangement and original isolation mounts. Use the actual diagram and components; do not invent a fourth separately numbered identical band.
8. Align the entire system and tighten only after all components are fitted. The selected guide prints no numerical torque or fixed clearance measurement.
9. Recheck and re-tighten the exhaust after the first 50–100 miles. Follow the selected guide and applicable vehicle service requirements without borrowing procedures from a different kit.

California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.