BRONDEX® Downpipes for the Mercedes AMG GT / GTC / GTS / GTR (C190 / R190) 4.0 V8 are designed to improve exhaust flow, boost horsepower, and provide a more aggressive exhaust note for these iconic AMG models. The 4.0L twin-turbocharged V8 engines in the AMG GT lineup benefit significantly from a downpipe upgrade, especially when paired with the right ECU tuning.