HKS Hi-Power Muffler WRX STI/WRX 2015 USDM - HKS31006-BF001

HKS Hi-Power Muffler WRX STI/WRX 2015 USDM is a Hi-Powered cat-back exhaust system designed for the 2015-2021 Subaru WRX and WRX STI (VAB/VAG), featuring SUS304 stainless steel construction, 3-inch piping, and dual 97mm burnt tips. It offers a lighter weight (approx. 33 lbs. vs 46 lbs. stock) and an aggressive, low-frequency sound while improving flow.

Key Features:

• Fitment: 2015–2021 Subaru WRX (Manual/CVT) & 2015–2021 WRX STI.
• System Type: Cat-back (replacing from the catalytic converter back).
• Material: High-grade SUS304 stainless steel muffler/tips with 409 stainless piping.
• Piping Diameter: ~3.0 in (74.7 mm) transitioning to dual 2.5 in (60.5 mm).
• Tip Diameter: 97 mm (3.8 in) L/R with burnt finish.
• Sound Level: Aggressive, deep tone, roughly 90dB.
• Design: Built-in resonance pipe to eliminate low-RPM cabin drone.
• Installation: Direct bolt-on to OEM downpipe; includes hardware and gasket.
• Provides a noticeable reduction in weight and improved exhaust flow compared to the stock system.
• It is designed to enhance the sound of the Subaru boxer engine.
• A 3-inch adapter might be required depending on the specific downpipe used (if not stock).