{"product_id":"hks-hi-power-catback-exhaust-17-20-honda-civic-si","title":"HKS Hi-Power Catback Exhaust for 17-20 Honda Civic Si","description":"\u003cul\u003e\n\u003cli\u003eFits 2017-2021 Honda Civic Si. \u003c\/li\u003e\n\u003cli\u003eConstructed from SUS304 stainless steel. \u003c\/li\u003e\n\u003cli\u003eBoosts sound level to 92 dB. \u003c\/li\u003e\n\u003cli\u003eOptimized flow with 60mm center pipe. \u003c\/li\u003e\n\u003cli\u003eSporty dual titanium tips. \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#TechnicalData\"\u003eTechnical Data\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#InstallGuide\"\u003eInstall Guide\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\u003ch3\u003eHKS Hi-Power Cat-Back Exhaust - 2017-2021 Honda Civic Si\u003c\/h3\u003e\n\n\u003cp\u003eHonda gave the 10th gen Si a genuinely good turbo engine and then wrapped it in one of the quietest exhausts they've ever fitted. That's the problem this solves. The HKS Hi-Power replaces the whole system from the cat back with a race-derived layout and dual titanium tips, and it turns a car that sounds like a rental into one that sounds like what it is.\u003c\/p\u003e\n\n\u003ch4\u003eSedan Or Coupe? Different Systems\u003c\/h4\u003e\n\n\u003cp\u003eCheck your body style before ordering, because these aren't interchangeable.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e31006-BH002\u003c\/strong\u003e fits the Civic Si sedan.\u003cbr\u003e\n\u003cstrong\u003e31006-BH001\u003c\/strong\u003e fits the Civic Si coupe.\u003c\/p\u003e\n\n\u003cp\u003eThe rear sections route differently between the two cars, so match yours rather than assuming any Si system fits.\u003c\/p\u003e\n\n\u003ch4\u003e81dB To 92dB, So Know What You're Buying\u003c\/h4\u003e\n\n\u003cp\u003eBeing direct about this, because it's the biggest change you'll notice.\u003c\/p\u003e\n\n\u003cp\u003eHKS measures the stock Si at 81dB and this system at 92dB. That's a substantial increase, and decibels are logarithmic, so the difference is bigger than the numbers suggest. This is not a subtle exhaust.\u003c\/p\u003e\n\n\u003cp\u003eIf you've been frustrated by how muted the factory Si sounds, that's exactly the point and you'll love it. If you park in a shared garage, leave for work at 5am, or have neighbors you like, factor that in honestly before you order.\u003c\/p\u003e\n\n\u003cp\u003eThe tone itself is the Hi-Power note, which is deeper and cleaner than the raspy drone cheaper systems produce on a small turbo engine. You're getting volume with quality behind it rather than just noise.\u003c\/p\u003e\n\n\u003ch4\u003eTitanium Tips, And Not Just For Looks\u003c\/h4\u003e\n\n\u003cp\u003eThe dual 97mm titanium tips are the visual signature of this system, and titanium is a genuine functional choice rather than a styling one.\u003c\/p\u003e\n\n\u003cp\u003eTitanium handles extreme heat far better than stainless, so the tips hold up to sustained exhaust temperature without discoloring badly or degrading. On a turbo engine, where exhaust gas temps run higher than a naturally aspirated car, that matters. And the way titanium takes on color with heat is why these look better after a year than they do out of the box.\u003c\/p\u003e\n\n\u003ch4\u003eSized For The 1.5T\u003c\/h4\u003e\n\n\u003cp\u003eThe center pipe runs 60mm, stepping down to 50mm in sections, feeding the 97mm tips.\u003c\/p\u003e\n\n\u003cp\u003eThat sizing is deliberate. Oversize the piping on a small turbo engine and you lose exhaust velocity, which hurts spool and low-end response. The 1.5T is a small displacement engine relying on its turbo, and keeping velocity up matters more here than chasing the biggest possible pipe. HKS sized this to flow considerably better than stock while keeping the car responsive where you drive it.\u003c\/p\u003e\n\n\u003ch4\u003eGround Clearance Was Considered\u003c\/h4\u003e\n\n\u003cp\u003eWorth knowing if your Si is lowered or heading that way. The system maintains 115mm of road clearance, which means it isn't hanging down waiting to catch every driveway and speed bump.\u003c\/p\u003e\n\n\u003cp\u003eThat's a real design consideration on a car a lot of people drop, and it's the difference between an exhaust you enjoy and one you're constantly wincing about.\u003c\/p\u003e\n\n\u003ch4\u003eSUS304 Stainless\u003c\/h4\u003e\n\n\u003cp\u003eBuilt from SUS304 stainless steel, which resists corrosion far better than mild steel and holds its finish. On a car that sees winter roads and salt, that's what determines whether the system still looks right in five years or has gone rusty and tired.\u003c\/p\u003e\n\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\n\u003cp\u003e2017-2021 Honda Civic Si Sedan (31006-BH002)\u003cbr\u003e2017-2021 Honda Civic Si Coupe (31006-BH001)\u003c\/p\u003e\n\n\u003cp\u003eSelect your body style at checkout.\u003c\/p\u003e\n\n\u003ch4\u003eWho Should Run This Exhaust\u003c\/h4\u003e\n\n\u003cp\u003eThis is for the Si owner who's spent time wishing the car sounded like it drives. You get real volume, a proper Hi-Power tone, titanium tips that look better as they age, and stainless construction that outlasts the car. Just be honest with yourself about the 92dB before you commit. Match your body style, bolt it on, and go enjoy the noise.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e 2017-2021 Honda Civic Si, sedan (31006-BH002) and coupe (31006-BH001). \u003cstrong\u003eType:\u003c\/strong\u003e cat-back exhaust system. \u003cstrong\u003eMuffler:\u003c\/strong\u003e Hi-Power with dual titanium tips. \u003cstrong\u003eTips:\u003c\/strong\u003e 97mm. \u003cstrong\u003eCenter pipe:\u003c\/strong\u003e 60mm, stepping to 50mm in sections. \u003cstrong\u003eMaterial:\u003c\/strong\u003e SUS304 stainless steel. \u003cstrong\u003eSound level:\u003c\/strong\u003e 92dB (stock 81dB). \u003cstrong\u003eGround clearance:\u003c\/strong\u003e 115mm.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n \u003cp\u003e2017-2020 Honda Civic Si\u003c\/p\u003e \n\u003c\/li\u003e\n\n\n\n\n\u003cli id=\"TechnicalData\"\u003e\n\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\u003cli id=\"InstallGuide\"\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n","brand":"HKS","offers":[{"title":"17-20 Civic Si Sedan","offer_id":46613941059618,"sku":"HKS-31006-BH002","price":1600.0,"currency_code":"USD","in_stock":false},{"title":"17-20 Civic Si Coupe","offer_id":46613941092386,"sku":"HKS-31006-BH001","price":1200.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/18602763.jpg?v=1787859046","url":"https:\/\/www.hybrid-racing.com\/products\/hks-hi-power-catback-exhaust-17-20-honda-civic-si","provider":"Hybrid Racing","version":"1.0","type":"link"}