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Alpha Competition insulated downpipe specifically for the McLaren 720S, 750S, and 765LT (engine code M840T) with 90mm diameter. Made from T304 steel with TIG welding, they allow for an increase of approximately 49 hp combined with an ECU remap (Stage 1) and a 50% reduction in engine compartment heat thanks to the insulation throughout the pipe. The sound is significantly more pronounced and aggressive than the original catalytic converters!