{"product_id":"valvetronic-designs-hfd-valved-exhaust-system-bmw-m3-m4-g80-g82-g83","title":"Valvetronic Designs HFD Valved Exhaust System – BMW M3\/M4 (G80\/G82\/G83)","description":"\u003cstyle\u003e.sl-desc h2{font-size:1.15em;letter-spacing:.06em;text-transform:uppercase;border-bottom:2px solid #111;padding-bottom:6px;margin:1.6em 0 .7em}.sl-desc h3{font-size:1em;margin:1.2em 0 .4em}.sl-desc ul{margin:0 0 1em 1.2em}.sl-desc li{margin:.25em 0}.va-table{width:100%;border-collapse:collapse;margin:.5em 0 1em;font-size:.95em}.va-table th{text-align:left;padding:10px 8px;border-bottom:2px solid #333;white-space:nowrap}.va-table td{padding:8px;border-bottom:1px solid #e5e5e5;vertical-align:top}.sl-note{font-size:.9em;color:#555;margin:.4em 0 1em}\u003c\/style\u003e\u003cdiv class=\"sl-desc\"\u003e\n\u003ch2\u003eOVERVIEW\u003c\/h2\u003e\n\u003cp\u003eThe Valvetronic Designs HFD (High Frequency Development) Exhaust System was built to completely redefine the S58's sound profile on the G8x M3\/M4 platform. It combines a clean-sheet HFD midpipe — engineered from the ground up to optimize exhaust pulse timing and acoustic balance — with Valvetronic's signature valved axle-back system for a smoother, more exotic inline-six tone that goes beyond a simple volume increase.\u003c\/p\u003e\n\u003cp\u003eDesigned as a complete solution rather than a bolt-on afterthought, the HFD system eliminates unwanted rasp and low-RPM harshness while preserving the high-frequency character that makes the S58 come alive. With the valves closed it is refined and civil for daily driving; with them open, dual pneumatic-style electronic valves deliver a sharper, more aggressive tone under load, switchable instantly via the included controller. The 3.0\" midpipe layout supports improved exhaust flow for higher-horsepower applications, including hybrid turbo setups.\u003c\/p\u003e\n\u003ch2\u003eSPECS\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTubing diameter: 3.0\" midpipe\u003c\/li\u003e\n\u003cli\u003eMaterial: T304 stainless steel\u003c\/li\u003e\n\u003cli\u003eValves: Electronic, with included controller; OEM valve-integration available\u003c\/li\u003e\n\u003cli\u003eConstruction: Precision TIG welds, mandrel-bent tubing throughout\u003c\/li\u003e\n\u003cli\u003eTips: Premium exhaust tips included on Full System configurations\u003c\/li\u003e\n\u003cli\u003e100% reversible — return to stock at any time\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePARTS INCLUDED\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHFD midpipe assembly\u003c\/li\u003e\n\u003cli\u003eValved axle-back exhaust system (Full System configurations)\u003c\/li\u003e\n\u003cli\u003eValve controller\u003c\/li\u003e\n\u003cli\u003eExhaust tips (Full System configurations)\u003c\/li\u003e\n\u003cli\u003eHardware and clamps\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTECH RESOURCES\u003c\/h2\u003e\n\u003ch3\u003eAdditional Parts Required\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNone.\u003c\/strong\u003e Valvetronic Designs ships this system as a complete kit; no additional hardware is required for a basic installation. Professional installation is recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/youtu.be\/0wpjSUXVG2Y\" target=\"_blank\" rel=\"noopener\"\u003eOfficial Valvetronic Designs install guide (YouTube)\u003c\/a\u003e — filmed for the G8x equal-length midpipe\/axle-back install process shared by this system.\u003c\/li\u003e\n\u003cli\u003eDesigned as a complete exhaust system for the BMW G8X platform; fully reversible back to stock.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThis item may currently be on preorder with Valvetronic Designs, with a restock estimated for mid-September 2026 — contact Speed Logic for the current lead time before ordering.\u003c\/li\u003e\n\u003cli\u003ePriced at Valvetronic Designs' direct list price.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePART NUMBER\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMW.G8X.M3.HFD.MP.BR\u003c\/strong\u003e — HFD Midpipe Only, Brushed T304 Stainless Steel — $1,349.99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMW.G8X.M3.VSES.HFD.BR.RC\u003c\/strong\u003e — Full System, 1x1 Carbon Fiber tips — $2,699.99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMW.G8X.M3.VSES.HFD.BR.BRSH\u003c\/strong\u003e — Full System, Brushed Steel tips — $2,699.99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMW.G8X.M3.VSES.HFD.BR.BRT\u003c\/strong\u003e — Full System, Burnt tips — $2,699.99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMW.G8X.M3.VSES.HFD.BR.BLK\u003c\/strong\u003e — Full System, Black tips — $2,699.99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMW.G8X.M3.VSES.HFD.BR.FC\u003c\/strong\u003e — Full System, Forged Carbon Fiber tips — $2,699.99\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eVEHICLE APPLICATIONS\u003c\/h2\u003e\n\u003ctable class=\"va-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eChassis\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM3\u003c\/td\u003e\n\u003ctd\u003eG80\u003c\/td\u003e\n\u003ctd\u003eS58 3.0L Twin-Turbo I6\u003c\/td\u003e\n\u003ctd\u003e2020+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM4\u003c\/td\u003e\n\u003ctd\u003eG82\u003c\/td\u003e\n\u003ctd\u003eS58 3.0L Twin-Turbo I6\u003c\/td\u003e\n\u003ctd\u003e2020+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM4 Convertible\u003c\/td\u003e\n\u003ctd\u003eG83\u003c\/td\u003e\n\u003ctd\u003eS58 3.0L Twin-Turbo I6\u003c\/td\u003e\n\u003ctd\u003e2020+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"Valvetronic Designs","offers":[{"title":"HFD Midpipe Only \/ Brushed T304 Stainless Steel \/ No Exhaust Tips (Midpipe Only)","offer_id":52607322030360,"sku":"BMW.G8X.M3.HFD.MP.BR","price":1349.99,"currency_code":"USD","in_stock":false},{"title":"Full System (Catback) \/ Brushed T304 Stainless Steel \/ (4) 1x1 Carbon Fiber (4.0 Outlet)","offer_id":52607322063128,"sku":"BMW.G8X.M3.VSES.HFD.BR.RC","price":2699.99,"currency_code":"USD","in_stock":false},{"title":"Full System (Catback) \/ Brushed T304 Stainless Steel \/ (4) Brushed Steel (3.5 Outlet)","offer_id":52607322095896,"sku":"BMW.G8X.M3.VSES.HFD.BR.BRSH","price":2699.99,"currency_code":"USD","in_stock":false},{"title":"Full System (Catback) \/ Brushed T304 Stainless Steel \/ (4) Burnt (3.5 Outlet)","offer_id":52607322128664,"sku":"BMW.G8X.M3.VSES.HFD.BR.BRT","price":2699.99,"currency_code":"USD","in_stock":false},{"title":"Full System (Catback) \/ Brushed T304 Stainless Steel \/ (4) Black (3.5 Outlet)","offer_id":52607322161432,"sku":"BMW.G8X.M3.VSES.HFD.BR.BLK","price":2699.99,"currency_code":"USD","in_stock":false},{"title":"Full System (Catback) \/ Brushed T304 Stainless Steel \/ (4) Forged Carbon Fiber (3.5 Outlet)","offer_id":52607322194200,"sku":"BMW.G8X.M3.VSES.HFD.BR.FC","price":2699.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/DSC08384_ShopifyCustomSize.png?v=1788388970","url":"https:\/\/speedlogicauto.com\/products\/valvetronic-designs-hfd-valved-exhaust-system-bmw-m3-m4-g80-g82-g83","provider":"SPEED LOGIC","version":"1.0","type":"link"}