Best Mods for First-Gen Lexus IS300: A Complete Guide

Why the Lexus IS300 Is a Modder’s Dream

Ask anyone who’s spent time building one and they’ll tell you—the first-gen Lexus IS300 is an ideal mod platform. It’s got all the right ingredients: rear-wheel drive, a strong inline-6 engine, timeless styling, and just enough refinement to keep it civil as a daily.

But the magic happens when you start personalizing it. Whether you're into stance, track performance, or balanced street builds, the IS300 can do it all—and more. If you’re thinking about getting started or looking to refine your setup, you’re in the right place.

Essential IS300 Performance Mods That Deliver

Let’s start with what’s under the hood. The 2JZ-GE engine is the same basic block as the turbocharged 2JZ-GTE found in the Supra, so it’s incredibly durable and responds well to basic upgrades.

Carlos Torres' long-term IS300 build (over 218,000 miles and still running strong) uses a smart combo of bolt-ons like an SRT intake with ECU tune, GReddy cat-back exhaust, and a Koyorad radiator for cooling. These upgrades boost breathing and engine longevity without needing forced induction—especially important if you live in a state with tough emissions rules like California.

If you’re considering something even wilder, check out this 2JZ-swapped IS300 wagon build—a full-blown JDM powerhouse with Supra heart and show-stopping presence.

Top Suspension Upgrades for Street and Track

Suspension is where the IS300 shines when dialed in properly. Coilovers like TEIN Flex Z, which Carlos runs, strike a nice balance between stiffness and ride comfort. Add in Hotchkis sway bars or strut braces like JIC Magic for a flatter, more planted feel during cornering.

This platform is also a favorite for stance builds, and with the right wheel and tire setup, you can tuck those arches cleanly. Just remember, form still needs to follow function—especially when dealing with camber and clearance.

Need more ideas? Our Lexus IS200 mod guide also shares great tips that overlap with IS300 setups.

Interior and Audio Mods That Keep It Functional

A build doesn’t stop at performance—it’s got to feel good inside too. Carlos' interior mix is a perfect balance: SPARCO R100 seats, Cipher Racing harnesses, a Nardi wheel, and modern audio upgrades like Alpine head units and Infinity Kappa speakers.

These kinds of upgrades help modernize the IS300 cabin while keeping it tuned to a driver-focused experience. They're also practical—especially if you're doing street/track crossover driving.

Want to go full custom? Take inspiration from our Steve Chandler Lexus IS200 1GFE Turbo build—a clean blend of JDM muscle and driver-focused detail.

Lexus IS300 Aero and Style Upgrades

If you're after that head-turning look, Lexus IS300s respond well to the right aero kits and paintwork. Carlos' Melbourne Metallic Red respray paired with a Vertex JDM front bumper, Street Aero kit, and TRD JDM spoiler shows how clean and aggressive you can go without being over the top.

Exterior mirrors like ARP carbon caps, Altezza grilles, or even OEM front bras give your build that old-school tuner vibe while keeping it fresh and distinctive. And of course, nothing beats the right set of wheels. Carlos runs 5Zigen FN01R-C wheels with Falken Azenis RT660+ tires—a solid combo for both stance and grip.

Real Build Inspiration: Carlos Torres’ IS300

The mods we’ve highlighted aren’t just theory—they’re real-world tested. You can see them all in action on Carlos Torres’ Lexus IS300 build, a prime example of how to modify this car the right way.

With over 20 years of ownership, a flawless maintenance record, and carefully selected upgrades, Carlos’ IS300 proves that with passion and planning, you can build something truly unique—and still drive it every day.

Author Bio:
Paul Doherty is the founder and editor of Stance Auto Magazine, passionate about connecting drivers with their perfect cars. From car reviews to deep dives into automotive news, Paul leads a team dedicated to bringing the culture of stance and community builds to a global audience.

More Lexus IS Features You’ll Love:

 Explore the full range of Lexus IS builds, guides, and tuning insights from the Stance Auto community:

• Discover the legacy in Carlos Torres’ 218K-mile IS300 build

• Get modding tips from our Lexus IS200 tuning guide

• See what’s possible in this 2JZ-swapped IS300 wagon masterpiece

• Learn about balance and boost in Steve Chandler’s IS200 1GFE turbo build

• Compare rivals in JDM vs Euro: IS300 vs BMW 3 Series

• Build smart with our IS300 dual-purpose street/track guide

Stay compliant in Cali with How Smog Laws Affect Car Mods

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