Vehicle Compatibility

Scion tC

• 2005 Scion tC
• 2006 Scion tC
• 2007 Scion tC
• 2008 Scion tC

This rear muffler system was engineered specifically for the first-generation tC platform.

HKS Heritage

HKS has been building performance products since 1973 and remains one of the most recognizable names in the aftermarket industry.

Known worldwide for:

• Turbocharger kits
• Cat-back exhaust systems
• Electronic boost controllers
• Suspension systems
• Engine management solutions

HKS products are trusted on everything from daily drivers to professional race cars.

What Makes the Hi-Power Series Popular?

The Hi-Power line is one of HKS’s longest-running and most successful exhaust families.

Its design philosophy focuses on:

• Improved exhaust flow
• Reduced restriction
• Aggressive appearance
• Street-friendly sound

Unlike many budget exhaust systems, HKS engineers its products to balance performance and comfort.

Improved Exhaust Flow

The factory Scion tC exhaust prioritizes:

• Quiet operation
• Emissions compliance
• Cost efficiency

The Hi-Power system uses a less restrictive design intended to improve exhaust gas flow.

Potential benefits include:

• Better throttle response
• Reduced backpressure
• Improved engine breathing
• More responsive acceleration feel

While naturally aspirated engines won’t see massive horsepower gains from an axle-back style upgrade alone, airflow improvements can still contribute to a more enjoyable driving experience.

Signature HKS Sound

For most enthusiasts, the biggest reason to install an aftermarket exhaust is sound.

Idle

• Slightly deeper tone than stock

Cruising

• Refined exhaust note
• Comfortable for daily driving

Acceleration

• More aggressive engine sound
• Increased driver engagement

High RPM

• Sportier tone
• Better engine character

The tC’s 2.4L engine responds well to a quality exhaust system, producing a deeper sound without becoming overly harsh.

Stainless Steel Construction

The system features stainless-steel piping designed to resist:

• Corrosion
• Road salt
• Moisture
• Long-term wear

Benefits include:

• Longer service life
• Better appearance
• Reduced maintenance
• Improved durability

This makes the exhaust well-suited for year-round use.

Classic Hi-Power Tip Design

One of the most recognizable aspects of HKS exhaust systems is the exhaust tip.

Benefits

• Aggressive appearance
• JDM styling
• Premium finish
• Instantly recognizable look

The larger polished tip helps modernize the appearance of the rear end while maintaining a clean factory-like fit.

Great for Daily Drivers

Many tC owners use their cars as:

• Daily commuters
• Weekend canyon cars
• College transportation
• Show vehicles

The Hi-Power system was designed with those drivers in mind.

It delivers:

• Better sound
• Improved aesthetics
• Increased enjoyment

without sacrificing comfort during long drives.

Excellent Pairing with Other Scion tC Mods

This exhaust works especially well alongside:

Intake Upgrades

• Cold air intakes
• Short ram intakes

Suspension

• Lowering springs
• Coilovers
• Sway bars

Wheels and Tires

• Lightweight wheels
• Performance tires

Engine Tuning

• ECU optimization
• Throttle response enhancements

Together these upgrades can significantly improve the overall feel of the vehicle.

Pros and Cons

Pros

• Authentic HKS quality
• Improved exhaust sound
• Less restrictive design
• Stainless-steel construction
• Excellent fitment
• JDM styling
• Daily-driver friendly

Cons

• Premium pricing compared to generic exhausts
• Modest horsepower gains on stock engines
• Rear muffler design offers less overall flow improvement than a full cat-back
• Some owners may prefer a louder exhaust note

Frequently Asked Questions

Does this exhaust fit all Scion tC models?

It is designed specifically for 2005-2008 Scion tC applications.

Is it a full cat-back exhaust?

This application is commonly marketed as a rear muffler system rather than a complete cat-back replacement.

Will it make my tC louder?

Yes. Expect a deeper and more aggressive exhaust note compared to the factory system.

Does it increase horsepower?

The less restrictive design can improve exhaust flow and throttle response, but gains will vary depending on the vehicle and supporting modifications.

Final Thoughts

The HKS 32003-BT001 Hi-Power Rear Muffler remains one of the best exhaust upgrades available for the first-generation Scion tC. Combining proven HKS engineering, stainless-steel durability, improved exhaust flow, and a refined JDM sound, it delivers exactly what most tC enthusiasts are looking for in an exhaust upgrade.

Because the Scion tC may have started life as a practical coupe, but with the right exhaust, it can finally sound like it knows it’s headed to a car meet.

Rear phase exhaust with lined stainless-steel piping