2021-UP BMW G80 M3 | G82 G83 M4 (incl. Competition)

Competition Series High Flow Catted Primary Downpipe

BM-EXH028CAT

This is for CATTED version, if you're looking for CATLESS version, please click here

Introducing our new Sport Series High Flow Catted Downpipes for your twin turbo S58 engine!  Fits 2021+ G80 M3 | G82 G83 M4 includes Competition.

FITS:

- BMW 2021-up G80 M3 | G82 G83 M4 includes Competition Package

CAUTION: This product is intended for OFF ROAD COMPETITION USE ONLY. Not legal for use on pollution controlled vehicles upon public road/highways. THIS PRODUCT IS FOR SALE FOR ALL 49 STATES EXCLUDING CALIFORNIA.  In addition to vehicle use verification, a Vehicle Compliance Waiver needs to be signed.

THIS ITEM IS NOT FOR SALE, INSTALLATION, OR USE ON LICENSED VEHILES IN THE STATE OF CALIFORNIA. 

The item is for sale for international customers without restriction.

Ease of Installation: (1 Easy, 5 Hard) 3

Installation Guide

Parts Checklist

Key Features:

• Now available for the 2021+ BMW G80 M3 | G82 G83 M4 includes Competition S58 Engines!
• Higher Max Horsepower Power Curve
• Higher Intial Torque Curve.  Torque curve hits faster and higher and longer.
• Better throttle response and faster turbo spool up times.
• Mandrel Bent 3" piping.  Smooth transition to the exhaust system.
• 100% Stainless Steel Construction
• 100% TIG welded for better quality welds
• Precision CNC machined turbocharger V-Band flange.
• Mirror polish or brush finish
• Available with high temperature black thermal coating to reduce underhood temperatures.
• Retains factory slip on style connection.
• Compatible with the factory or aftermarket exhaust systems.
• Track tested durability.
• Includes all hardware for complete installation.
• Limited Lifetime Warranty.

We use a 200 cell metallic core for our Sports Series High Flow Catted Downpipes. By having less cells per square inch, these individual "cells" are bigger in size thus allowing exhaust gas to pass through it more easily. Thus, the lower the cell count, the higher the flow. Higher flow = more power, faster turbo spool up (less turbocharger lag) and better throttle response. Bottom line, faster. The benefits of a metallic catalytic converter vs a ceramic like the factory is that it can take higher temperatures and is more durable (last longer). They are also lighter than their ceramic counterparts.Restrictions in the exhaust system robs horsepower and torque especially on turbocharged cars.  Thus, removing as much exhaust flow restrictions will increase horsepower and torque significantly.  The factory catalytic converter found in the factory downpipe is a big culprit of this and is a major exhaust flow restriction. The factory catalytic converter is made up of catalyst material formed into "honeycomb" weaves. Exhaust gas must pass through these tiny "honeycomb" weaves on their way to the exhaust system thus causing a major exhaust flow restriction. It also causes turbulence after the catalytic converter which causes the exhaust flow to slow down (which increases restriction). By replacing the factory downpipe/catalytic converter with our Sports Series High Flow Metallic Catted Downpipe, more power is unleashed! 

Our Sport Series High Flow Catted Downpipes is constructed out of 100% 304 grade stainless steel and utilize mandrel bent piping. They are 100% TIG welded by our in house fabricators and built in the USA.  The factory turbocharger turbine housing utilizes a 3.5" V-Band flange which we have duplicated and CNC machined cut out of billet 304 stainless steel.  Stainless Steel CNC machined O2 sensor and laser cut brackets are TIG welded using stainless steel rods.  The O2 sensor is positioned at the factory location.  The factory donut flange design is retained.  100% bolt on. 

Our downpipes are designed to fit perfectly with either the factory exhaust system or your aftermarket exhaust system.  There are no compatibility issues whatsover.  The downpipes will come by default with brushed finish.

The 2021+ BMW G80 M3 | G82 G83 M4 incl. Competition has 2 primary catalytic converters and 2 secondary catalytic converters for a total of 4 catalytic converters.  Our Sport Series High Flow Catted Downpipes replace the primary sections.

OPTIONS

Ceramic Thermal Coating - The purpose of ceramic coating downpipes is to keep heat from the exhaust gases inside the downpipe from radiating out.  This keeps underhood temperatures lower and less heat absortion by nearby parts/surfaces.  Another added benefit is that by keeping in heat (energy) in the exhaust gases inside the downpipe, exhaust flow velocities stay up, resulting in lower backpressure.  The ceramic coating also adds additonal corrosion resistance.  We utilize the best ceramic coating possible.  Our thermal coating can resist up to 2000F of heat.  It is available in black only (all the other colors cannot withstand heat that high).

 

Midpipe Crossover Pipe - The G80/G82 utilizes a Y style Midpipe.  Since both downpipes on are on the right side of the vehicle, the Midpipe Crossover Pipe connects the left side downpipe to the left side of the Y midpipe.  The factory crossover pipe goes underneath the transmission and is ovalized for clearance.  Our Midpipe Crossover Pipe does not ovalize but retains a round shape for ideal flow conditions.