{"product_id":"hks-hi-power-cat-back-exhaust-single-exit-subaru-wrx-sti-2015-2021-31006-bf003","title":"HKS Hi-Power Cat Back Exhaust Single Exit Subaru WRX \/ STI 2015-2021 | 31006-BF003","description":"\u003cp\u003eThe \u003cstrong\u003eHKS Hi-Power Cat-Back Exhaust System\u003c\/strong\u003e is a premium performance upgrade engineered specifically for the 2015-2021 Subaru WRX and WRX STI. Designed and manufactured by HKS — one of Japan's most respected performance tuning brands — this single-exit muffler system delivers a refined, aggressive exhaust note while improving exhaust flow over the restrictive factory system. Whether you're building a track-ready STI or simply want a more exhilarating daily-driver WRX, the Hi-Power series strikes the ideal balance between performance gains and street-friendly sound levels.\u003c\/p\u003e\n\u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Exhaust Flow\u003c\/strong\u003e — Mandrel-bent piping minimizes restriction and turbulence for improved scavenging and potential horsepower gains across the RPM range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignature HKS Hi-Power Sound\u003c\/strong\u003e — Engineered muffler internals produce a deep, sporty exhaust tone that is aggressive under acceleration without being excessively loud at idle or cruising speeds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Stainless Steel Construction\u003c\/strong\u003e — Built from high-grade stainless steel for superior corrosion resistance, long-term durability, and a polished appearance that holds up to daily driving and track use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-Exit Configuration\u003c\/strong\u003e — Clean, sleek single-exit tip design complements the WRX\/STI rear bumper fascia for a purposeful, OEM-plus aesthetic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On Fitment\u003c\/strong\u003e — Precision-engineered to match factory mounting points and flanges for a straightforward, no-modification installation on compatible 2015 WRX and WRX STI models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Exhaust Back Pressure\u003c\/strong\u003e — Improved exhaust gas evacuation supports turbocharger efficiency, helping the EJ\/FA powerplant breathe more freely under boost.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHKS Quality Assurance\u003c\/strong\u003e — Every component is manufactured to exacting HKS standards and undergoes rigorous quality control, a brand with decades of proven motorsport heritage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHKS Hi-Power Cat-Back Muffler \/ Exhaust Section (Single Exit)\u003c\/li\u003e\n\u003cli\u003ePolished Stainless Steel Exhaust Tip\u003c\/li\u003e\n\u003cli\u003eOEM-Style Mounting Hardware \u0026amp; Gaskets\u003c\/li\u003e\n\u003cli\u003eRubber Exhaust Hangers\u003c\/li\u003e\n\u003cli\u003eHKS Installation Instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e31006-BF003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eHKS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eHi-Power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSystem Type\u003c\/th\u003e\n\u003ctd\u003eCat-Back Exhaust (Muffler Section)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExit Configuration\u003c\/th\u003e\n\u003ctd\u003eSingle Exit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSound Level\u003c\/th\u003e\n\u003ctd\u003eSporty \/ Street-Oriented (Not Race Loud)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e4957266941485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003ctd\u003ehks31006-BF003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HKS","offers":[{"title":"Default Title","offer_id":42875919302752,"sku":"hks31006-BF003","price":1499.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/HKS-Hi-Power-Cat-Back-Exhaust-Single-Exit-Subaru-WRX-STI-2015-2021-31006-BF003.png?v=1781618795","url":"https:\/\/www.importimageracing.com\/products\/hks-hi-power-cat-back-exhaust-single-exit-subaru-wrx-sti-2015-2021-31006-bf003","provider":"Import Image Racing","version":"1.0","type":"link"}