Compatible Acura RSX Models

The Mishimoto Performance Aluminum Radiator is compatible with:

• 2002 Acura RSX
• 2003 Acura RSX
• 2004 Acura RSX
• 2005 Acura RSX
• 2006 Acura RSX

Perfect for:

• RSX Type-S builds
• Turbo K-series setups
• Track-day cars
• Daily-driven street builds
• Drag Hondas
• Canyon-focused RSXs

Because no K-series owner hears VTEC crossover and decides:
“Yep, shifting early sounds smart.”

By replacing your current stock RSX radiator with a best of the road Mishimoto performance aluminum radiator, you’re going to in an instant notice a cooler more efficient running engine.

Improved Cooling Performance

One of the biggest upgrades over the stock radiator is:

• Better heat dissipation
• Improved thermal stability
• Reduced heat soak
• More consistent operating temperatures

Especially beneficial during:

• High-RPM pulls
• Track sessions
• Turbocharged driving
• Summer traffic
• Aggressive canyon runs

Where factory cooling systems occasionally begin emotionally overheating.

All Mishimoto Acura RSX radiators are designed and engineered to maximise cooling efficiency, spice up engine functions, and so much importantly give protection to your car from overheating.

Full Aluminum 2-Row Core Design

The Mishimoto radiator features:

• Full aluminum construction
• 2-row cooling core
• Increased thermal efficiency

Specifications:

• Overall size: 27.6” x 18.8” x 1.9”
• Core size: 13.75” x 27.52”
• Core thickness: 1.4”
• Inlet/outlet size: 1.25”
• Tank wall thickness: 0.08”

This improves:

• Heat transfer capability
• Cooling consistency
• Thermal recovery
• Long-term durability

Especially important because K-series engines spend most of their lives aggressively visiting redline.

All Mishimoto performance radiators feature a lightweight dual core, 100 per cent brazed aluminum and polished end tanks. The direct OEM fit makes installation effortless and no cutting or modification is required. It’s the ideal upgrade to the stock radiator.

Full Aluminum Construction Benefits

Unlike factory radiators that commonly use:

• Plastic end tanks
• Aging OEM materials
• Crimped seams

The Mishimoto radiator uses:

• Welded aluminum tanks
• Reinforced construction
• Performance-grade cooling materials

Helping improve:

• Durability
• Pressure resistance
• Cooling system longevity
• High-performance reliability

Because old Honda radiator plastics plus VTEC abuse eventually stop cooperating.

All Mishimoto radiators come with a high pressure 1.3 bar Mishimoto radiator cap, magnetic drain plug and a very good warranty.

Compatible with the 2002–2006 Acura RSX
Overall Size: 27.6” x 18.8” x 1.9” / Core Size: 13.75” x 27.52” / Rows: 2

Perfect for Turbo & Track Builds

This radiator is especially valuable for:

• Turbocharged RSXs
• K24 swap builds
• Time attack cars
• Drag setups
• High-compression street builds
• Hondata-tuned K-series projects

Improved cooling helps reduce:

• Heat soak
• Coolant spikes
• Thermal fatigue
• Power loss during extended driving

Especially because turbo K-series cars generate temperatures wildly disproportionate to engine size.

Better Reliability for Daily Drivers

Even naturally aspirated RSXs benefit from:

• Improved cooling consistency
• Reduced overheating risk
• Better long-term reliability
• Preventative maintenance advantages

Especially important because:

• Most RSXs now have high mileage
• Original cooling systems are aging
• Many cars survived years of modifications already

And somehow many K-series engines still refuse to quit out of pure Honda stubbornness.

Inlet & Outlet: 1.25” / Core Thickness: 1.4” / Tank Wall Thickness: 0.08”

OEM-Style Direct Fit Installation

The radiator is engineered for:

• Direct bolt-in installation
• OEM hose compatibility
• Factory mounting integration

Typical installation requires:

• Coolant drain
• Socket set
• Hose clamp pliers
• Approximately 1-3 hours

No major:

• Fabrication
• Cutting
• Custom mounting typically required

Which is fortunate, because RSX projects already spiral into suspension, wheel, and intake upgrades immediately.

TIG-welded aluminum radiator includes high-pressure rad cap and magnetic drain plug. Mishimoto Lifetime Warranty
Drain Plug Length: 0.047 inch

Why Upgrade the Acura RSX Radiator?

Common reasons RSX owners upgrade radiators include:

• Aging OEM radiator failure
• Turbocharging
• Track overheating concerns
• K-series swap cooling needs
• Preventative maintenance
• Cooling reliability improvements

A performance radiator remains one of the smartest upgrades for K-series Hondas because:

• Heat kills consistency quickly
• High-RPM engines create serious thermal load
• Modified RSXs overwhelm stock cooling systems fast

Especially once boost pressure enters the conversation.

Final Verdict

For 2002-2006 Acura RSX owners wanting improved cooling performance and long-term reliability, the Mishimoto Performance Aluminum Radiator delivers serious thermal management upgrades with durable aluminum construction.

Key benefits include:

• Full aluminum construction
• 2-row cooling core
• Improved heat dissipation
• Better thermal stability
• Ideal for turbo and track builds
• Direct-fit installation

Most importantly, your RSX finally stops treating every VTEC pull like a coolant temperature emergency meeting.