What material is the HKS Hi-Power 409 exhaust made from?

The HKS Hi-Power 409 exhaust system features piping and muffler canisters constructed from SUS304 stainless steel. This material is chosen for its good resistance to corrosion and its durability.

What kind of sound can I expect from this exhaust?

You can expect a deeper, sportier exhaust note compared to the stock system. The straight-through muffler design helps reduce backpressure and contributes to a more aggressive tone for the RB25DET engine.

Does this exhaust system come with all the necessary hardware for installation?

This cat-back exhaust system is designed as a direct replacement for the factory exhaust from the catalytic converter back. While it typically bolts up to existing points, it's always recommended to refer to the manufacturer's installation instructions for a complete list of included hardware and any potential additional items needed.

HKS Hi-Power 409 Cat-Back Exhaust RB25DET 31006-AN014

Name: HKS Hi-Power 409 ECR33 RB25DET
Brand: HKS
SKU: hks-hks-hi-power-409-ecr33-rb25det-t14-141079
Price: 734.72 USD
Availability: BackOrder

HKS Hi-Power 409 ECR33 RB25DET

$734.72

On Backorder — Expected to ship by Jul 19, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

HKS Hi-Power 409 cat-back exhaust for ECR33 RB25DET.

Key Features

This product is the HKS Hi-Power 409 cat-back exhaust system.
Designed for the ECR33 chassis with the RB25DET engine.
Features SUS304 stainless steel piping and muffler canister for corrosion resistance.
Utilizes a straight-through muffler design to reduce backpressure.
Optimized piping diameter for the RB25DET engine.
Aims to improve exhaust flow and provide a sportier exhaust note.

This cat-back exhaust system is designed for the ECR33 chassis with the RB25DET engine. Please verify compatibility with your specific vehicle configuration.

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Product Details

This HKS Hi-Power 409 cat-back exhaust system is what you get when you order part number 31006-AN014. It's designed for the ECR33 chassis with the RB25DET engine. A cat-back system replaces the exhaust from the catalytic converter back to the tailpipe, and this HKS unit is built to improve exhaust flow and give your RB25DET a more aggressive sound.

The Hi-Power 409 series uses SUS304 stainless steel for its piping and muffler canister, which is a well-built material that holds up well against corrosion. The muffler features HKS's signature straight-through design, which helps reduce backpressure and allows the RB25DET engine to breathe more freely. This can lead to a noticeable improvement in throttle response and a deeper, sportier exhaust note that’s more pronounced than stock, without being overly raspy. The piping diameter is optimized for the RB25DET to ensure good scavenging and performance across the RPM range. Installation is typically a bolt-on affair, replacing your factory exhaust section directly.

When installing this cat-back system, you'll want to ensure all hangers and connections are properly aligned to prevent any rattling or leaks. It's a popular choice for RB25DET owners looking to enhance both the sound and performance of their vehicle. Make sure to check local emissions regulations, as exhaust modifications can affect compliance.