Black Mamba 3.5" (90 mm) to 3" (76 mm) Decat Downpipe for VW Golf 8 GTI and Skoda Octavia NX VRS 2WD 2.0 TFSI EA888.4 engines, engineered for optimal exhaust flow and power gains. Constructed from premium T304 stainless steel with handmade TIG welds, this direct bolt-on upgrade features a 3.5" (90 m..