Lexus IS500 Axleback Upgrade: Sound and Fit Guide

By REMARK Exhaust | Published: 2026-10-19

Category: Product Reviews

Learn how to upgrade your Lexus IS500 with an axleback exhaust: sound expectations, fit check, and step-by-step installation tips.

Quick Answer

An axleback exhaust is the easiest way to give your 2022-2025 Lexus IS500 a deeper, more aggressive tone without changing the stock mid-pipe or resonators. It bolts on behind the rear axle, so you keep the V8's natural sound while adding volume and character.

Why Choose an Axleback Over a Catback for the IS500

An axleback replaces only the mufflers and tips, keeping the factory mid-pipe and catalytic converters intact. That means less drone on the highway and a sound that stays refined when you're cruising. A catback swaps the entire rear section, which can shift the tone more dramatically but often adds weight and complexity.

For the IS500's 5.0L V8, the factory induction sound is already a highlight. A well-designed axleback like the REMARK quad tip system blends exhaust volume with that induction note, so the engine remains the star rather than being drowned out by the exhaust.

What to Expect From the Sound

The REMARK IS500 axleback produces a low grumble at idle and through about 2500 RPM, making it the dominant sound during startup and low-speed driving. Above 2500 RPM and while cruising, the exhaust fades into the background, letting the V8's induction sound take over. This balance is ideal for daily driving where you want attention without constant drone.

Keep in mind that sound perception varies by cabin insulation and tip style. If you want a more aggressive presence, opt for the slant quad tips that are unique to the IS500; they add a visual punch without changing the acoustic character.

Step-by-Step Axleback Installation for the IS500

Gather Tools and Prepare the Car: You'll need a jack, jack stands, 12mm and 14mm sockets, a ratchet, penetrating oil, and a torque wrench. Park on a flat surface, chock the front wheels, and let the exhaust cool completely. Always support the car with jack stands, never just a jack.
Remove the Stock Axleback Section: Spray the flange bolts and hanger bolts with penetrating oil and wait 10 minutes. Unbolt the flanges where the axleback connects to the mid-pipe, then remove the rubber hangers. Slide the stock muffler assembly off the hangers and set it aside. If a bolt is seized, apply more oil and use a breaker bar; don't force a stripped nut.
Compare the New Axleback Fitment: Before installing, lay the REMARK axleback alongside the stock unit to confirm the hanger positions and flange angles match. Check that the tip style you chose aligns with the bumper cutouts. A quick dry fit catches misalignment before you tighten everything down.
Install the New Axleback: Lift the new axleback into place, slide the hangers into the rubber mounts, and loosely bolt the flanges. Leave the bolts hand-tight to allow adjustment. Don't tighten anything until all hangers are seated and the tips are centered.
Align Tips and Torque All Fasteners: Adjust the tips so they sit evenly in the bumper cutouts, then torque the flange bolts to the manufacturer's spec (typically 30-35 ft-lb). Re-check hanger seating and ensure no contact with the bumper or underbody. After a short test drive, re-check the bolts and hangers for any loosening.

Product Spotlight

Axleback w/ Mufflers - Lexus IS500 [2022-2025]: High flow Quad tip axleback exhaust for Lexus IS500 with aggressive deep tone and slant quad tip styling unique to the IS500. This axleback gives you a bold, deep sound at low RPM while staying quiet enough for daily driving, and the slant tips set your IS500 apart visually.
Axleback w/ Mufflers - Lexus IS500 [2022-2025]