Fabspeed Mercedes-Benz AMG E-63s / GT63 Sport Cat Downpipes (2015-2021)

The downpipe is the first section of the exhaust system after the turbocharger, and on most factory turbocharged vehicles it is also the single most restrictive exhaust component due to its large catalytic converter and tight mandrel bends. Turbocharged car enthusiasts who shop for aftermarket downpipes range from street-driven daily drivers looking for a bolt-on power and sound improvement to track-day and time attack builders prioritizing maximum flow on tuned builds with larger turbos. Upgrading the downpipe removes the primary restriction in the turbocharged exhaust path and can produce measurable gains in peak horsepower, turbo spool time, and exhaust note character when properly paired with an ECU calibration. Well-known platforms that benefit strongly from downpipe upgrades include the Subaru WRX and STI with the EJ205 and EJ257, the Volkswagen GTI EA888, Ford Mustang EcoBoost 2.3L, Mitsubishi Lancer Evolution 4B11T, and the BMW N54 and N55 engines.Popular UpgradesTop afterma...

Performance exhaust systems improve exhaust sound, flow, appearance, and driving character for cars, trucks, SUVs, Jeeps, diesel vehicles, and high-performance builds. Shop more than 7,400 cat-back exhausts, axle-back systems, headers, downpipes, mid-pipes, X-pipes, H-pipes, mufflers, resonators, catalytic converters, exhaust tips, valve controllers, and installation hardware at Black Ops Auto Works. This collection includes exhaust upgrades from trusted brands such as Borla, CORSA Performance, MagnaFlow, MBRP, Kooks Headers, AWE Tuning, Akrapovič, Thermal R&D, Solo Performance, Invidia, Gibson, BBK, Stainless Works, Mishimoto, HKS, ISR Performance, Fabspeed, Granatelli, Formula Z, and CornerStone Performance. Use the filters to shop by vehicle, exhaust type, material, pipe diameter, exit configuration, tip finish, sound level, and emissions requirements. Shop Performance Exhaust Systems by Category Choose the exhaust category that matches your performance goal, preferred sound,...

Fabspeed Motorsport is a Pennsylvania-based performance parts manufacturer that specializes in exhaust systems, sport catalytic converters, headers, downpipes, intake systems, and carbon fiber components engineered specifically for exotic and high-performance European sports cars including Porsche, Ferrari, Lamborghini, McLaren, BMW M, and Audi R8. Every Fabspeed product is TIG-welded from aerospace-grade stainless steel or titanium in the USA, dyno-tested for measurable power and sound improvement, and designed as a direct bolt-on replacement that preserves the factory catalytic converter monitoring system or provides an explicit sport cat solution for emissions-compliant upgrades. Exotic car owners who have already maximized software and cosmetic modifications choose Fabspeed exhaust systems because the brand's specialty focus on a narrow range of platforms produces fit quality and sound character that universal exhaust manufacturers cannot achieve. The brand's XperTune ECU calibr...