{"product_id":"valvetronic-bmw-g8x-m3-m4-hfd-midpipe-copy","title":"Valvetronic BMW G8X M3 \/ M4 HFD Midpipe","description":"\u003ch2\u003eBMW G80 M3 \/ G82–G83 M4 HFD MIDPIPE \u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eHFD Midpipe + Valved Axle-Back Exhaust System — T304 Stainless or Grade 5 Titanium\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eThe BMW G8X platform delivers incredible performance—but the sound still leaves room for improvement. The Valvetronic Designs \u003cstrong\u003eHFD (High Frequency Development)\u003c\/strong\u003e Exhaust System was developed to completely redefine the S58's sound profile by combining our High Frequency Development midpipe with our signature valved axle-back system. HFD represents a clean-sheet approach to exhaust engineering focused on optimizing exhaust pulse timing, improving acoustic balance, and creating a smoother, more exotic inline-six tone — refined and quiet when the valves are closed, aggressive and engaging when opened.\u003c\/p\u003e\n\u003ch3\u003eSound Clip: HFD Exhaust System\u003c\/h3\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/oS-CmuztqIs\" title=\"BMW G8X HFD Exhaust\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/bfymkN7Gb-w\" title=\"BMW G8X HFD 400 Cell Downpipes + Midpipe + Axle-Back\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch3\u003eWhy It Works\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHFD midpipe design:\u003c\/strong\u003e developed from the ground up to refine exhaust pulse timing and deliver a smoother, higher-quality sound profile.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValved axle-back system:\u003c\/strong\u003e full control over sound — quiet and refined when closed, aggressive and engaging when opened.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull system integration:\u003c\/strong\u003e engineered as a complete exhaust solution for optimal flow, tone, and performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-inch midpipe layout:\u003c\/strong\u003e supports improved exhaust flow and higher-horsepower applications, including hybrid turbo setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSound \u0026amp; Control\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRefined inline-six tone — smoother, more exotic signature across the entire RPM range.\u003c\/li\u003e\n\u003cli\u003eHigh-frequency character — sharper, more aggressive tone under load without excessive harshness.\u003c\/li\u003e\n\u003cli\u003eValve control — switch between comfortable daily driving and full performance sound instantly.\u003c\/li\u003e\n\u003cli\u003eReduced rasp — engineered to eliminate unwanted frequencies common in less-refined systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConstruction \u0026amp; Options\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterials:\u003c\/strong\u003e T304 stainless steel or ultra-light Grade 5 titanium.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight savings:\u003c\/strong\u003e significant reduction vs. the factory system (varies by material).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCraftsmanship:\u003c\/strong\u003e precision TIG welds, mandrel-bent tubing, and premium construction throughout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectronic valve control\u003c\/strong\u003e with included controller; OEM valve integration available.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2020+ BMW G80 M3\u003c\/li\u003e\n\u003cli\u003e2020+ BMW G82 M4 (Coupe)\u003c\/li\u003e\n\u003cli\u003e2020+ BMW G83 M4 (Convertible)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHFD midpipe assembly\u003c\/li\u003e\n\u003cli\u003eValved axle-back exhaust system\u003c\/li\u003e\n\u003cli\u003eValve controller\u003c\/li\u003e\n\u003cli\u003eExhaust tips\u003c\/li\u003e\n\u003cli\u003eHardware and clamps\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTubing diameter: 3.0\" midpipe\u003c\/li\u003e\n\u003cli\u003eMaterials: T304 stainless steel (or Grade 5 titanium)\u003c\/li\u003e\n\u003cli\u003eValves: electronic, with remote controller (OEM integration available)\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on; midpipe and axle-back can be installed independently\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/youtu.be\/0wpjSUXVG2Y\" rel=\"noopener\" target=\"_blank\"\u003eClick here for the G8X install guide\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eWarranty\u003c\/h3\u003e\n\u003cp\u003eAll products manufactured by Valvetronic Designs are guaranteed free from manufacturing defects in materials and workmanship at the time of sale. 304 stainless steel and titanium exhaust tubes and welds carry a Lifetime of Ownership limited warranty against defects in workmanship or material, including penetrating rust. Mufflers and resonators carry a 3-year limited warranty. Vacuum pots, electronic remotes, mechanical valves, and controllers carry a 1-year limited warranty. Tip finish carries a 1-year limited warranty. Warranty applies to the original purchaser and is non-transferable.\u003c\/p\u003e","brand":"Valvetronic Designs","offers":[{"title":"HFD MIDPIPE ONLY \/ BRUSHED T304 STAINLESS STEEL \/ NO EXHAUST TIPS (MIDPIPE ONLY)","offer_id":49273870516483,"sku":"BMW.G8X.M3.HFD.MP.BR","price":1499.99,"currency_code":"USD","in_stock":true},{"title":"HFD MIDPIPE ONLY \/ BRUSHED T304 STAINLESS STEEL \/ 1X1 CARBON (4\" OUTLET)","offer_id":49273870549251,"sku":null,"price":1499.99,"currency_code":"USD","in_stock":true},{"title":"HFD MIDPIPE ONLY \/ BRUSHED T304 STAINLESS STEEL \/ FORGED CARBON (3.5\" OUTLET)","offer_id":49273870582019,"sku":null,"price":1499.99,"currency_code":"USD","in_stock":true},{"title":"HFD MIDPIPE ONLY \/ BRUSHED T304 STAINLESS STEEL \/ BRUSHED STEEL (3.5\" OUTLET)","offer_id":49273870614787,"sku":null,"price":1499.99,"currency_code":"USD","in_stock":true},{"title":"HFD MIDPIPE ONLY \/ BRUSHED T304 STAINLESS STEEL \/ BURNT (3.5\" OUTLET)","offer_id":49273870647555,"sku":null,"price":1499.99,"currency_code":"USD","in_stock":true},{"title":"HFD MIDPIPE ONLY \/ BRUSHED T304 STAINLESS STEEL \/ BLACK (3.5\" OUTLET)","offer_id":49273870680323,"sku":null,"price":1499.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM EQUAL-LENGTH CATBACK \/ BRUSHED T304 STAINLESS STEEL \/ NO EXHAUST TIPS (MIDPIPE ONLY)","offer_id":49273870713091,"sku":null,"price":1499.0,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM EQUAL-LENGTH CATBACK \/ BRUSHED T304 STAINLESS STEEL \/ 1X1 CARBON (4\" OUTLET)","offer_id":49273870745859,"sku":null,"price":2999.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM EQUAL-LENGTH CATBACK \/ BRUSHED T304 STAINLESS STEEL \/ FORGED CARBON (3.5\" OUTLET)","offer_id":49273870778627,"sku":null,"price":2999.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM EQUAL-LENGTH CATBACK \/ BRUSHED T304 STAINLESS STEEL \/ BRUSHED STEEL (3.5\" OUTLET)","offer_id":49273870811395,"sku":null,"price":2999.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM EQUAL-LENGTH CATBACK \/ BRUSHED T304 STAINLESS STEEL \/ BURNT (3.5\" OUTLET)","offer_id":49273870844163,"sku":null,"price":2999.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM EQUAL-LENGTH CATBACK \/ BRUSHED T304 STAINLESS STEEL \/ BLACK (3.5\" OUTLET)","offer_id":49273870876931,"sku":null,"price":2999.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM + 400 CELL CATTED DOWNPIPES \/ BRUSHED T304 STAINLESS STEEL \/ NO EXHAUST TIPS (MIDPIPE ONLY)","offer_id":49273870909699,"sku":null,"price":1499.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM + 400 CELL CATTED DOWNPIPES \/ BRUSHED T304 STAINLESS STEEL \/ 1X1 CARBON (4\" OUTLET)","offer_id":49273870942467,"sku":null,"price":4999.0,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM + 400 CELL CATTED DOWNPIPES \/ BRUSHED T304 STAINLESS STEEL \/ FORGED CARBON (3.5\" OUTLET)","offer_id":49273870975235,"sku":null,"price":4999.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM + 400 CELL CATTED DOWNPIPES \/ BRUSHED T304 STAINLESS STEEL \/ BRUSHED STEEL (3.5\" OUTLET)","offer_id":49273871008003,"sku":null,"price":4999.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM + 400 CELL CATTED DOWNPIPES \/ BRUSHED T304 STAINLESS STEEL \/ BURNT (3.5\" OUTLET)","offer_id":49273871040771,"sku":null,"price":4999.99,"currency_code":"USD","in_stock":true},{"title":"FULL SYSTEM + 400 CELL CATTED DOWNPIPES \/ BRUSHED T304 STAINLESS STEEL \/ BLACK (3.5\" OUTLET)","offer_id":49273871073539,"sku":null,"price":4999.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/9084\/0579\/files\/1hfd.png?v=1784126280","url":"https:\/\/legendsautoparts.com\/products\/valvetronic-bmw-g8x-m3-m4-hfd-midpipe-copy","provider":"Legends Auto Parts","version":"1.0","type":"link"}