185-00871 LAPTORR EXHAUST Downpipe for S55

185-00871
Downpipe(Catalyst-free)

Applicable Model
BMW F87 M2 Competition (S55 engine)
BMW F80 M3 (S55 engine)
BMW F82-M4 (S55 engine)
　
It's a straight-type design with the first catalyst immediately after the turbine removed.
The stock catalytic converter is located where exhaust backpressure is highest, creating extremely harsh conditions for the engine. Tuning to increase engine power further intensifies these harsh conditions, raising concerns about catalyst melting and knocking. A straight-type downpipe reduces exhaust pressure, improves exhaust flow, and significantly reduces the burden on the engine.


・ The warning light illuminates when the monitoring-side lambda sensor is functioning.
・Avoid starting the engine in poorly ventilated areas.
・Not compliant with vehicle inspection regulations / Competition parts (Japan)