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The Toyota Supra A90 is one of the most iconic sports cars in recent history, blending sleek design with BMW’s powerful B58 engine. While the Supra comes well-equipped from the factory, many enthusiasts look for performance upgrades to maximize the car’s potential. One of the most effective modifications is installing a B58 Supra downpipe, which dramatically improves exhaust flow, turbo efficiency, and engine response.

What Is a B58 Supra Downpipe?

A downpipe is the component that connects the turbocharger to the rest of the exhaust system. In stock form, the downpipe contains a restrictive catalytic converter, which reduces airflow and limits turbo performance. Upgrading to a B58 Supra downpipe removes this restriction, allowing exhaust gases to exit more freely, reducing backpressure, and enhancing the turbo’s ability to spool quickly.

B58 Supra downpipes are available in two main styles:

1. Catted Downpipe: Includes a high-flow catalytic converter to maintain emissions compliance.

2. Catless Downpipe: Removes the catalytic converter entirely for maximum performance gains.

Choosing between these options depends on your performance goals, local regulations, and how aggressive you want your Supra’s exhaust system to be.

Performance Benefits of a B58 Supra Downpipe

Installing a B58 Supra downpipe offers several key advantages:

1. Increased Horsepower and Torque

By reducing exhaust restriction, the turbocharger operates more efficiently, resulting in faster spool times and higher boost levels. With proper tuning, a B58 Supra downpipe can add 50–80 horsepower and 60–100 lb-ft of torque, depending on other modifications and the type of downpipe installed.

2. Improved Turbo Response

A high-flow downpipe reduces turbo lag, meaning the car responds more quickly when you press the accelerator. This improved throttle response makes the Supra feel more aggressive and engaging, especially during high-speed acceleration or spirited driving.

3. Enhanced Exhaust Sound

One of the most noticeable changes with a B58 Supra downpipe is the exhaust note. Catless options deliver a loud, aggressive exhaust, while catted downpipes provide a deeper, more refined tone. Either choice enhances the overall driving experience, giving your Supra a more performance-focused character.

4. Reduced Engine and Turbo Temperatures

Lower exhaust backpressure reduces stress on the turbo and engine components, helping to maintain cooler temperatures during spirited driving or track sessions. This increases reliability and helps prevent premature wear.

Catted vs. Catless B58 Supra Downpipes

Choosing between a catted and catless B58 Supra downpipe requires careful consideration:

Catted Downpipe Advantages

• Maintains emissions compliance

• Reduces the likelihood of triggering a check engine light (CEL)

• Subtle, daily-drivable exhaust sound

• Ideal for street-driven Supras

Catted Downpipe Considerations

• Slightly lower horsepower gains compared to catless

• Higher cost due to catalytic materials

Catless Downpipe Advantages

• Maximum power and turbo efficiency

• Aggressive exhaust sound and pops

• Ideal for track or off-road use

Catless Downpipe Considerations

• May trigger CEL and fail emissions tests

• Louder exhaust noise, not suitable for all environments

A B58 Supra downpipe—whether catted or catless—paired with proper tuning ensures maximum performance gains while maintaining safe operation.

Tuning Requirements for a B58 Supra Downpipe

After installing a B58 Supra downpipe, a performance tune is highly recommended. The ECU must adjust for increased airflow and altered exhaust dynamics. Tuning benefits include:

• Optimized boost levels

• Correct air-fuel ratios

• Prevention of CEL and fault codes

• Maximum horsepower and torque gains

• Safe engine operation under high boost

Popular tuning solutions for the B58 engine include Bootmod3 (BM3), MHD, MG Flasher, and EcuTek, which allow for custom maps and safe performance enhancements.

Cost and Top Brands

The price of a B58 Supra downpipe depends on the brand, materials, and design:

• Catless stainless steel downpipe: $200 – $450

• High-flow catted downpipe: $450 – $900

• Premium coated or stainless steel options: $900 – $1,200

Trusted manufacturers include VRSF, ARM Motorsports, CTS Turbo, Active Autowerke, MAD, and Evolution Racewerks. Choosing a reputable brand ensures durability, proper fitment, and optimal performance.