Name: MRT Polished Off The Grid JL Axle-Back Jeep Wrangler 3.6L 2018+
Brand: MRT Engineered Performance
SKU: 90R137
Price: 209.99 USD
Availability: InStock

// WHY THIS PART EARNS ITS SPOT

DIY installation for the backyard mechanic

T304 Stainless Steel for corrosion resistance

Engineered, designed and manufactured in the USA

// THE FULL RUNDOWN

The MRT Wrangler 3.6L Off The Grid JL Axle-Back system has a loud, deep muscle car sound and is handcrafted in corrosion resistant T304 Stainless Steel. Base systems include T304 polished SS 2.5" mandrel bent tube. There is a Turndown tip on this system for optimal ground clearance. This system is engineered for the best sound to match your Jeep and provides increased performance from increased exhaust flow. It was designed with off-roading in mind. Off The Grid is the loudest MRT exhaust with enough elevated sound to Get Noticed, plenty of opportunity to Feel the Performance and packaged in a design without excessive drone. Features: Fitment: Proposition 65 ⚠ WARNING: Cancer and Reproductive Harm https://www.P65Warnings.ca.gov

// WILL IT FIT? THE STRAIGHT ANSWER

VEHICLE	YEARS	TRIM
Jeep Wrangler	2018-2021	Unlimited Sahara
Jeep Wrangler	2018-2021	Sport
Jeep Wrangler	2018-2021	Unlimited Sport S
Jeep Wrangler	2018-2021	Unlimited Sport
Jeep Wrangler	2018-2021	Rubicon
Jeep Wrangler	2018-2021	Unlimited Rubicon
Jeep Wrangler	2018-2019	Unlimited Moab
Jeep Wrangler	2018-2021	Sport S
Jeep Wrangler	2019-2020	Rubicon Deluxe
Jeep Wrangler	2020	Unlimited Rubicon Deluxe
Jeep Wrangler	2020	Unlimited Rubicon Xtreme
Jeep Wrangler	2021	Unlimited Rubicon 392
Jeep Wrangler	2021	Freedom
Jeep Wrangler	2021	Unlimited Sahara Altitude
Jeep Wrangler	2021	Unlimited 80th Anniversary
Jeep Wrangler	2021	Unlimited Sahara High Altitude
Jeep Wrangler	2021	Unlimited Sahara 4xe
Jeep Wrangler	2021	Unlimited High Altitude 4xe
Jeep Wrangler	2021	Unlimited High Altitude
Jeep Wrangler	2021	80th Anniversary
Jeep Wrangler	2021	Unlimited Islander
Jeep Wrangler	2021	Unlimited Sport Altitude
Jeep Wrangler	2021	Unlimited Freedom
Jeep Wrangler	2021	Unlimited Willys Sport
Jeep Wrangler	2021	Unlimited Rubicon 4xe
Jeep Wrangler	2021	Willys Sport
Jeep Wrangler	2021	Unlimited Willys
Jeep Wrangler	2021	Willys
Jeep Wrangler	2021	Islander
Jeep Wrangler JK	2018	Sahara
Jeep Wrangler JK	2018	Unlimited Sahara
Jeep Wrangler JK	2018	Unlimited Sport
Jeep Wrangler JK	2018	Sport S
Jeep Wrangler JK	2018	Sport
Jeep Wrangler JK	2018	Rubicon
Jeep Wrangler JK	2018	Unlimited Rubicon
Jeep Wrangler JK	2018	Unlimited Willys Wheeler
Jeep Wrangler JK	2018	Unlimited Sport S

JAP FITMENT PROMISE // If we confirm fitment for your rig and it doesn't fit, return shipping is on us. No restocking fee. That's the deal.

// GETTING IT TO YOUR GARAGE

THIS PART //

Ships UPS/FedEx ground — estimated $24.95. Additional ground items in the same order ship at reduced rates. Exact rate calculated at checkout.

REAL-COST SHIPPING

We charge what the carrier charges — no padding, no games. Ground parcels via UPS/FedEx, signature required. You see the exact number before you pay.

1-2 DAY HANDLING

Most in-stock parts leave the warehouse within 1-2 business days. Built-to-order parts show extended lead times.

LTL FREIGHT FOR THE BIG STUFF

Bumpers, hardtops, axles and full kits ship LTL truck freight (typically $400-500 per unit, plus shipping protection). Freight is charged per unit — two bumpers means two freight charges. Inspect before signing and note any damage on the delivery receipt.

30-DAY RETURNS

Unused, uninstalled parts in original packaging within 30 days. RMA required — start with a quick message. Shipping charges are non-refundable; freight returns quote at carrier rates.

FULL SHIPPING & RETURNS POLICY

// PAY YOUR WAY

CHECKING PAYMENT NETWORK…

ALL MAJOR CARDS + WALLETS

Visa, Mastercard, Amex, Discover, Apple Pay, Google Pay and Link one-tap checkout — live in our Stripe checkout right now. Card numbers never touch our servers.

BUY NOW, PAY LATER — LIVE

Klarna, Afterpay and Zip are active at checkout on eligible orders. Pick your split at payment — get the lift now, pay as you wheel. No JAP paperwork, approval happens right in checkout.

CRYPTO — LIVE AT CHECKOUT

Pay with crypto directly in our Stripe checkout — select the crypto option at payment and settle in USDC and supported coins. On-chain payment, standard order flow, same warranty.

3-D SECURE + RADAR ANTI-FRAUD

Every card payment runs Stripe Radar machine-learning fraud screening, with 3-D Secure (Visa Secure / Mastercard Identity Check) stepping in automatically when your bank requires it. Your card, verified by your bank.

PCI-DSS L1

HIGHEST CARD-SECURITY CERTIFICATION

AES-256 + TLS 1.3

ENCRYPTED IN TRANSIT & AT REST

TOKENIZED

WE NEVER SEE YOUR CARD NUMBER

Payments are processed by Stripe — the same infrastructure behind Amazon, Ford and Shopify checkouts. Dispute protection and receipt trails on every order. See our Privacy Policy.

// COVERED WHEN IT COUNTS

THIS PART //

Backed by the full MRT Engineered Performance manufacturer warranty. JAP is an authorized dealer — your warranty is valid from day one.

FULL MANUFACTURER WARRANTY

Every part ships new in the box with the manufacturer's standard warranty — terms and duration vary by brand (typically 1 year to limited lifetime on hard parts). We only sell through authorized channels, so coverage is never voided by gray-market sourcing.

WE RUN THE CLAIM WITH YOU

Warranty issue? Don't fight the manufacturer's phone tree alone. Hit our team with your order number and photos — we open the claim with the brand and stay on it until it's resolved.

WHAT WARRANTY DOESN'T COVER

Defects in materials and workmanship are covered. Trail damage, improper installation, modification, and normal wear items (bushings, pads, wear plates) generally are not — that's standard across every brand we carry.

SEPARATE FROM RETURNS

Warranty claims (defects after use) and returns (unused parts within 30 days) are different lanes. Not sure which applies? Message us first — we'll route it the fast way.

START A WARRANTY CLAIM

FITMENT	Jeep Wrangler
BRAND	MRT Engineered Performance — shop all MRT Engineered Performance parts →
PART #	90R137
SKU	90R137
CATEGORY	Exhaust Parts > Mufflers
AVAILABILITY	IN STOCK
RETURNS	30-day return window

MRT Polished Off The Grid JL Axle-Back Jeep Wrangler 3.6L 2018+