Evolution Racewerks B58 Competition Series 4.5" Catless Downpipe - G20 M340i
Evolution Racewerks B58 Competition Series 4.5" Catless Downpipe - G20 M340i

Evolution Racewerks B58 Competition Series 4.5" Catless Downpipe - G20 M340i

Regular price $707.00 Sale price $661.00
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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) 2

Installation Guide

Parts Checklist

Key Features:

  • Fitment for the new BMW B58 Engine
  • Higher Max Horsepower Power Curve
  • Higher Intial Torque Curve.  Torque curve hits faster, higher, and longer
  • Better throttle response and faster turbo spool up times
  • Mandrel Bent 4.5" 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
  • Brush Finish (standard) or optional Polish Finish
  • Available with high temperature Black Thermal Coating to reduce underhood temperatures
  • Optional - Additional O2 sensor bung for wideband O2 sensors (comes with pre-installed plug)
  • Optional EGT sensor bung for EGT gauges (comes with pre-installed plug)
  • Compatible with the factory or aftermarket exhaust systems
  • Track tested durability
  • Includes all hardware for complete installation
  • Limited Lifetime Warranty

 

Thermal Coated Black Finish

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 Competition Series 4.5" Catless Downpipe, more power is unleashed!You will feel the difference instantly. While the 32whp and 16wtq gains are awesome, one of the best aspects of the downpipe is that the gains are not just peak gains. Examine the dyno graphs and you will notice the powerband shifting to the left. What this means is that turbo lag is reduced with power coming on faster. Gains are throughout the powerband as well. Your car will feel like a totally different beast. As if it had woken from it's sleep!

SO WHY 4.5" PIPING? The new turbochargers on the B58 engines utilize a much larger 4.5" outlet compared to the 4" outlet on the older N55 engines. If we ran a 4" downpipe flange inlet so that we can use 4" tubing, a "step" would be formed between the turbocharger outlet and downpipe inlet. Exhaust gas for the turbocharger would hit this "step" and a lot of turbulence would form at this point and cause backpressure. Backpressure this close to the turbocharger would greatly affect performance. Thus, to ensure that we get unobstructed flow from the turbocharger outlet to the downpipe inlet, we had to CNC machine a new 4.5" flange to match. This allows a seamless transition and eliminate any possible turbulence which would cause backpressure. Though this presented another challenge for us as 4.5" tubing is not readily available and hard to source. Our motto "Performance, No Compromise" prevailed at the end and through hard diligence and many phone calls, we finally found a source for the material.  Even though the material was considerably more expensive than standard 4" stainless steel, we wanted to give our customers the best by producing the best product possible.

Please contact us via the contact page form to start a return or exchange. The return/exchange process must be started within 1 week of delivery, after 1 week we will not be able to issue a refund/exchange. A 20% restocking fee will be applied to any return once the order has been shipped. For any questions regarding returns or exchanges feel free to contact us at sales@horizonmotorsport.com or reach out to us via the contact form and we would be happy to help.

You can find additional details on our return and exchange policy here.

 

 

OUR GOAL

Horizon Motorsport has one goal: to make our clients happy. We aim to provide the highest level of customer service and the highest caliber parts, all at the most competitive prices. Have a question or concern about a product we sell? Send us an email at sales@horizonmotorsport.com.

QUALITY is KEY

Every piece of carbon fiber that leaves our location in Los Angeles, CA is quality checked extensively prior to shipment. Every piece is backed up by our fitment and finish guarantee.

THE BEST CUSTOMER SERVICE

At Horizon Motorsport our mission is to provide unparalleled customer service. As a small business we pride ourselves on creating long lasting relationships with our customers who know that they can count on us for any of their BMW needs.

A COMPANY OWNED BY ENTHUSIASTS

Horizon Motorsport was founded in 2019 in Los Angeles, CA by fellow BMW enthusiasts. We have experience with nearly all makes and models and have been actively involved in the Southern California BMW scene for over 3 years. Because of our unique insight into the BMW community, we choose to carry only the highest quality parts from the highest quality brands on the market.