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Evolution

High Flow Catted Downpipes

Name: High Flow Catted Downpipes
Brand: Evolution
SKU: BM-EXH020CAT

$2,155.50 $1,916.23 Save $239.27

SKU: BM-EXH020CAT

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Moderate — 2–4 hours

Overview

The Evolution Racewerks N63 Engine 200 CEL Catted Downpipes are designed to unleash the potential of your twin-turbo S63 engine. They replace the restrictive factory catalytic converter, which is a major bottleneck, with a high-flow metallic 200-cell core. This upgrade allows your engine to breathe easier, resulting in immediate gains in horsepower and torque, improved throttle response, and quicker turbo spool-up.

Constructed from 100% 304-grade stainless steel with mandrel-bent piping, these downpipes ensure smooth exhaust flow and durability. They feature a replicated factory turbocharger turbine housing's 3.5” V-Band flange using CNC-machined billet stainless steel and retain the original O2 sensor position for a straightforward bolt-on installation. Available in a brushed finish, mirror polish, or a high-temperature black thermal coating.

Show original supplier description

The Evolution Racewerks High Flow Catted Downpipes are engineered to enhance the performance of the BMW M550ix N63 (G Chassis). By replacing the restrictive factory catalytic converter with a high-flow 200-cell metallic unit, these downpipes unlock higher maximum horsepower and a more potent torque curve that hits faster and lasts longer. This upgrade also contributes to improved throttle response and quicker turbo spool-up times. Constructed from 100% 304-grade stainless steel, these downpipes feature mandrel-bent 3-inch piping for optimal exhaust flow and are 100% TIG welded for superior quality. The turbocharger V-band flange is precision CNC-machined from billet stainless steel to match the factory specification. These downpipes are designed as a 100% bolt-on installation and are compatible with both factory and aftermarket exhaust systems, retaining the factory donut-style gasket. CAUTION: This product is intended for OFF-ROAD COMPETITION USE ONLY and is not legal for use on pollution-controlled vehicles on public roads or highways. It is for sale for all 49 states EXCLUDING CALIFORNIA. Installation and use on licensed vehicles in California are prohibited. A Vehicle Compliance Waiver is required for purchase and use. International customers may purchase without restriction.

Vehicle Symptoms

Check engine light on (catalyst efficiency)
Sluggish acceleration under boost
Delayed turbo spool-up
Reduced fuel economy
Exhaust smell or excessive heat under hood

Diagnostic Codes

P0420 – Cat Sys Efficiency Below Threshold (B1)
P0430 – Cat Sys Efficiency Below Threshold (B2)

Relevant Conversations

N63 downpipes 200 cell vs catless
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N63 downpipe install time and difficulty
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Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

Brand	Evolution
Part Number	BM-EXH020CAT
Category	Exhaust

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Shipping

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