ISR Performance Parts

The best ISR Performance parts to start with are their single-exit cat-back exhausts and their chassis hardware for Nissan Z cars. ISR built its catalog around enthusiast favorites — the Nissan 350Z, G35, and newer Z, plus the FR-S/BRZ/86 platform — so their single GT cat-back systems and CNC billet differential braces are the natural first picks. Check your year and model before ordering, since fitment is platform-specific.

ISR Performance is an aftermarket brand known for accessible performance parts aimed squarely at the drift and street communities. Rather than chasing ultra-premium price tags, ISR focuses on simple, effective designs — single-exit exhausts, solid bushings, and billet braces — that deliver the sound and feel enthusiasts want without complicated installs.

The exhaust lineup is the heart of the collection. The GT Single cat-back systems use a single large-diameter muffler for an aggressive, free-flowing note and noticeable weight savings over dual-exit factory systems. The Series II line takes it further with full titanium construction on models like the Nissan Z RZ34, cutting weight dramatically while keeping the signature single-exit look.

Beyond exhausts, ISR covers the supporting hardware that transforms how a car feels. Solid differential mount bushings and CNC billet differential braces reduce drivetrain slop on Z33 and G35 chassis, giving sharper throttle response and more consistent launches. VQ35DE oil cooler kits address a real weak point on track-driven 350Z and G35 models by keeping oil temperatures in check during hard use.

When shopping ISR parts, decide your priority: sound and weight savings point to a cat-back or the titanium Series II, while sharper response and reliability point to the bushings, braces, and cooling parts. All are designed as bolt-on components for their specific platforms, so basic hand tools cover most installs.

Pair your ISR build with other proven exhaust options from our cat-back and exhaust mufflers and tips collections, or compare against heavyweights like Invidia and HKS. Standouts here include the ISR GT Single cat-back for FR-S/BRZ/86, the VQ35DE oil cooler kit, and the CNC billet differential brace. Read 6 reasons upgrading your exhaust is worth the investment for more on what a good exhaust delivers.

Will an ISR cat-back fit my car?

ISR systems are platform-specific — the GT Single covers 2013–2026 FR-S/BRZ/86 models, while Z-car systems are built for the Z33, Z34, or RZ34 chassis. Match the year range in the product title to your car exactly.

Does a single-exit exhaust need a tune?

A cat-back exhaust alone does not require a tune; the ECU adapts to the freer-flowing section behind the catalytic converters. A tune is only needed if you add headers or downpipes at the same time.

How hard is a differential brace or bushing install?

Most owners finish in a few hours with jack stands and hand tools. Solid bushings increase drivetrain noise slightly — that's normal and part of the more connected feel.

Why choose full titanium over stainless steel?

Titanium saves significant weight over stainless — valuable for track cars where every pound counts. Stainless systems like the standard GT Single are more budget-friendly and still deliver the sound and flow benefits.