Looking to add that perfect aggressive growl to your vehicle while unlocking improved performance? The HKS Hi-Power SPEC-R Catback Exhaust is designed to give you the deep, rich tone you crave, while enhancing airflow, reducing backpressure, and boosting your vehicle's overall power. Whether you're after improved acceleration, better throttle response, or just that unmistakable exhaust note, this catback system delivers it all.
Fitment Information
- Subaru WRX STi Sedan AWD (2004, 2005, 2006, 2007)
- Also fits SPEC-C model
Emissions Compliance
- HKS exhaust systems maintain all emissions equipment intact without any alterations, replacements, or modifications.
Specs & Features
- Main Material: High-quality Titanium construction for maximum durability and lightweight performance
- Diameter of Tip: 120mm for an aggressive exhaust note and bold visual appeal
- Diameter of Center Pipe: 75mm to enhance airflow and reduce backpressure for increased horsepower and torque
- Sound Level: Stock sound level of 84 dB vs. HKS sound level of 93 dB for a more aggressive and sporty exhaust note
- Silencer Options: TYPE-H round silencer for enhanced performance or TYPE-S oval silencer for quieter operation
- Perfect Fitment: Designed to directly replace stock components without modification
- Material Durability: Made from SUS304 stainless steel for long-lasting strength, with a titanium tip for additional durability and style
- Easy Installation: Bolt-on system with all necessary hardware for a hassle-free setup
- Performance Gains: Proven to enhance engine performance by reducing backpressure and improving exhaust flow
Product Description
Elevate your vehicle's performance and sound with the HKS Hi-Power SPEC-R Catback Exhaust, designed for enthusiasts who demand more from their ride. Crafted from titanium and SUS304 stainless steel, this system is engineered for both durability and performance, offering a significant increase in horsepower and torque. The 75mm center pipe diameter improves airflow, while the 120mm tip delivers an aggressive exhaust note.
Experience a deeper, more powerful sound with a HKS exhaust level of 93 dB, compared to the stock 84 dB. Whether you choose the performance-focused TYPE-H round silencer or the quieter TYPE-S oval silencer, you can expect an enhanced driving experience with reduced backpressure and faster throttle response. The HKS Hi-Power SPEC-R Catback Exhaust is perfect for those looking for both style and power, offering a bold exhaust note without compromising on performance. Upgrade today and let your vehicle’s true potential roar!
Redline360 sells only genuine and authentic HKS products.


More in this category
HKS Exhaust
Subaru WRX STi Exhaust
Subaru WRX STi Parts
Reviews on this product
Ordering from Redline360
Redline360 is an Authorized Dealer so we only sell authentic and genuine parts and accessories.
Order updates, tracking and info
Our goal is your complete satisfaction. Upon ordering, you will receive an email confirmation of your order along with your invoice. You will be able to log into our website 24/7 to check on your order at any time. Your order is processed Monday through Friday from 8am to 6pm PST as soon as it is placed. Once your order ships, we will email you a tracking number so you can track your package.
Protect your purchase
Redline360 offers our customers piece of mind! We have partned with Extend to offer you Extend Product Protection and Extend Shipping Protection. Read about each protection that Extend offers to Redline360 customers!
Multiple distribution points ready to serve you!
We ship from multiple locations around the United States so you receive your part as quick as possible. Not every warehouse stocks all the same parts, so the closest warehouse to you that has the part in stock is where your order will ship from. We ship from California, Nevada, Indiana, Michigan, Florida, Texas and Pennsylvania.
Secure Ordering
We take security seriously! We are never exposed to your credit card information, and it's never stored. Credit card transactions go through the credit card processor directly. We also offer various other payment methods such as PayPal, Affirm Financing (Pay over time), Amazon Pay, Apple Pay and more!
Any non CARB compliant items can not ship California. We will notify you if we have to cancel your order.
Some products may be subject to local rules, laws and regulations in certain areas. Always check your local laws to determine legal restrictions. We are not responsible if you buy a product that is not legal in your area.
For items that have free shipping, free shipping only applies to the lower 48 states.
Questions? Contact us.
Actual item may vary from picture