{"product_id":"m177-m178-equal-length-turbo-exhaust-manifold-patent-pending-3d-printed-c63-glc63-amg-gt","title":"M177 \/ M178 Equal-Length Turbo Exhaust Manifold — Patent-Pending, 3D-Printed | C63 · GLC63 · AMG GT","description":"\u003cp\u003e\u003cstrong\u003e\u003cu\u003eMade to order — 4 week lead time. Cerakote option adds 1–2 weeks.\u003c\/u\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe first equal-length exhaust manifold for the M177\/M178 4.0L twin-turbo V8 — \u003cstrong\u003epatent-pending, CFD-developed, and metal 3D-printed\u003c\/strong\u003e so the geometry that scavenges the hot-V is the geometry you bolt on. 100% made in America.\u003c\/p\u003e\n\u003ch4\u003ePhysics first. Then the right way to build it.\u003c\/h4\u003e\n\u003cp\u003eMost aftermarket manifolds start with a question: what can we make cheaply? We started with a different one: what runner geometry actually scavenges an M177 hot-V? We designed exactly that — equal-length runners so every cylinder's blowdown pulse reaches the turbine on even spacing, shallow approach angles into a CFD-shaped collector, and a 46 mm turbo entry sized to the turbine's real limit — validated it in CFD, and then chose the manufacturing process that reproduces it faithfully.\u003c\/p\u003e\n\u003cp\u003eFor this part, that's \u003cstrong\u003emetal 3D printing — laser powder bed fusion in 316L stainless.\u003c\/strong\u003e Not because it's novel, but because it's the best way to build tight-radius runner crossings, continuous wall paths, and CFD-exact internal surfaces as a single seamless structure. No weld seams in the hottest, highest-stress zone on the engine. No draft angles or parting lines compromising the flow path. The part you bolt on is the part we modeled. \u003ca href=\"\/blogs\/tech-guides\/exhaust-manifold-physics-why-our-patent-pending-m177-manifold-spools-400-800-rpm-sooner\"\u003eRead the full engineering write-up →\u003c\/a\u003e\u003c\/p\u003e\n\u003ch4\u003eWhy the geometry matters\u003c\/h4\u003e\n\u003cp\u003eAnyone can make a runner bigger. But raw volume alone slows exhaust gas velocity and lets pulses collide and reverse back into the port — trapping burnt gas and killing spool. Our tuned runner paths and organically merged collector keep each cylinder's pulse \u003cstrong\u003eseparated and moving\u003c\/strong\u003e, so one cylinder's blowdown helps draw the residual charge out of the next. Cleaner evacuation, more fresh air per stroke, a harder-driven turbine. That geometry is \u003cstrong\u003epatent-pending\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch4\u003eProven on the dyno — not just on paper\u003c\/h4\u003e\n\u003cp\u003eBack-to-back, same car, same tune, manifold change only: \u003cstrong\u003e+66 whp at 5,200 rpm, +52 whp average from 4,500–5,600 rpm, and +60 lb-ft of peak wheel torque\u003c\/strong\u003e — the range these cars actually live in. \u003cstrong\u003eIt matches the stock manifold's peak torque 500 rpm sooner, then keeps climbing another 60 lb-ft to a level the stock part never reaches.\u003c\/strong\u003e Full boost arrives 400–800 rpm sooner, and the curve never drops below stock anywhere in the sweep. This is what real scavenging looks like: a broad, usable powerband, not a narrow top-end spike.\u003c\/p\u003e\n\u003ch4\u003eBuilt to outlast\u003c\/h4\u003e\n\u003cp\u003eHeat-treated 316L stainless, 3D-printed as a single optimized structure with CNC-machined sealing faces and V-band turbo flanges — no weld seams to crack under thermal cycling. Optional Cerakote thermal barrier.\u003c\/p\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFirst equal-length exhaust manifold for the M177 — even pulse spacing, equal backpressure every cylinder\u003c\/li\u003e\n\u003cli\u003ePatent-pending inboard-exhaust scavenging design — exclusive to ModalWorks\u003c\/li\u003e\n\u003cli\u003eMetal 3D-printed (LPBF) — chosen because it reproduces the CFD-optimized geometry exactly, seam-free\u003c\/li\u003e\n\u003cli\u003eDyno-documented: +66 whp @ 5,200 rpm, +52 whp avg 4,500–5,600, +60 lb-ft peak torque, manifold alone\u003c\/li\u003e\n\u003cli\u003eReaches stock's peak torque 500 rpm sooner; stock never reaches 850 lb-ft, ours does at ~4,950 rpm\u003c\/li\u003e\n\u003cli\u003eFull boost 400–800 rpm sooner; no losses at any rpm\u003c\/li\u003e\n\u003cli\u003eCFD-developed runners and collector — 46 mm turbo entry (stock 42 mm, +20% area)\u003c\/li\u003e\n\u003cli\u003eHeat-treated 316L stainless, CNC-machined sealing surfaces\u003c\/li\u003e\n\u003cli\u003eOptional Cerakote thermal-barrier finish\u003c\/li\u003e\n\u003cli\u003e100% made in America\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eVehicle Applications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e2015–2021 Mercedes C63 AMG, Base (W205)\u003c\/li\u003e\n\u003cli\u003e2015–2021 Mercedes C63 AMG, Coupe (C205)\u003c\/li\u003e\n\u003cli\u003e2015–2021 Mercedes C63 AMG S, Base (W205)\u003c\/li\u003e\n\u003cli\u003e2015–2021 Mercedes C63 AMG S, Coupe (C205)\u003c\/li\u003e\n\u003cli\u003e2015–2021 Mercedes AMG GT (C190)\u003c\/li\u003e\n\u003cli\u003e2015–2021 Mercedes AMG GT S (R190)\u003c\/li\u003e\n\u003cli\u003e2017–2021 Mercedes AMG GT C (C190)\u003c\/li\u003e\n\u003cli\u003e2017–2021 Mercedes AMG GT R (R190)\u003c\/li\u003e\n\u003cli\u003e2017–2021 Mercedes GLC63 AMG (X253)\u003c\/li\u003e\n\u003cli\u003e2017–2021 Mercedes GLC63 AMG S (X253)\u003c\/li\u003e\n\u003cli\u003e2017–2021 Mercedes GLC63 AMG, Coupe (C253)\u003c\/li\u003e\n\u003cli\u003e2017–2021 Mercedes GLC63 AMG S, Coupe (C253)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eRunning M177.2 turbos? An M177.2-specific version is in development and coming soon — \u003ca href=\"\/pages\/contact\"\u003econtact us\u003c\/a\u003e to be notified.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch4\u003eNotes\u003c\/h4\u003e\n\u003cp\u003eDirect bolt-on to OEM flanges and the factory turbo interface. Due to the increased runner size, the OEM decorative heat shield requires a simple trim to clear. The Cerakote option provides thermal insulation on the exhaust if you prefer to run without the shield.\u003c\/p\u003e\n\u003cp\u003eImages show raw (uncoated) 316L units as printed.\u003c\/p\u003e\u003ch3\u003eAbout ModalWorks Inc.\u003c\/h3\u003e\u003cp\u003eGenuine ModalWorks Inc. component, supplied by Dyne Performance USA. Manufacturer reference: \u003ca href=\"https:\/\/modalwork.com\/products\/m177-c63-glc63-amg-gt-exhaust-manifold\" rel=\"nofollow\"\u003ehttps:\/\/modalwork.com\/products\/m177-c63-glc63-amg-gt-exhaust-manifold\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003e\u003cem\u003eContact \u003ca href=\"mailto:sales@dyneperformance.us\"\u003esales@dyneperformance.us\u003c\/a\u003e for fitment confirmation, lead time, or installation.\u003c\/em\u003e\u003c\/p\u003e","brand":"ModalWorks Inc.","offers":[{"title":"No","offer_id":60287445303436,"sku":"MW-C63-EXH-MANI-V1-RAW","price":3599.0,"currency_code":"USD","in_stock":true},{"title":"Yes","offer_id":60287445336204,"sku":"MW-C63-EXH-MANI-V1-CEK","price":3849.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0791\/3177\/1020\/files\/mw-m177-equal-length-manifold-pair.jpg?v=1789701295","url":"https:\/\/dyneperformance.us\/products\/m177-m178-equal-length-turbo-exhaust-manifold-patent-pending-3d-printed-c63-glc63-amg-gt","provider":"Dyne Performance USA ","version":"1.0","type":"link"}