Introducing our new Competition Series 4" Downpipes for your BMW B46 four cylinder turbo engine! Fits all 2016+ 230i / 330i / 430i / 530i / X3 30i / X4 30i! The B46 engine is found in all U.S. spec cars. The downpipe is different than the B48 found in the EU / Asia spec cars. You must get the correct downpipe for your car as they are not interchangeable.
Our Competition Series Catless 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 4" 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. Since the outlet of the turbocharger is 4" and the factory exhaust system is 3", the factory downpipes reduces size using short transitions from 4" before the catalytic convert and 3" afterwards. Due to space needed for the cataylic converter, the factory downpipes reduce in size using very short transitions. Since our catless downpipes delete the cataylic converter, we have more space. Thus, we use very long transitions. These longer transitions allow the exhaust gas time to smoothly transition from the larger piping to the smaller. This results in less exhaust turbulence and backpressure which again improves throttle response and increase turbocharger spool times (less turbocharger lag).
One of the main features of our B46 downpipe is the CNC machined solid stainless steel billet ball joint. The factory downpipe uses a press formed process to produce the "ball" joint to connect to the factory exhaust. This process can be done very inexpensively when done in large productions runs. Unfortunately, the drawback of this press formed "ball" joint is that the interior of the pipe also mimics the outside. When exhaust flows through a pipe, the majority of the exhaust flow tends to stay on the outer edges of the pipe. Thus, when exhaust flows into the "ball" section, it goes into the valley created by the "ball" joint and then back up the other side. This creates tremedous amounts of turbulence in the exhaust flow right at that section. Turbulence in turn, slows down exhaust flow velocities as well as increase back-pressure. It's a well known fact that with turbocharged cars, you want the least amount of back-pressure while still maintaining high exhaust flow velocities. Why? Because low back-pressure and high velocities allow the turbocharger to spin faster. This equates to reducing turbocharger lag and faster spool times. Throttle response is also improved. We had originally thought to use the same press form process to manufacture our downpipes. However, very quickly we noticed this flaw to the process and decided to CNC a solid stainless steel billet "ball" joint. This allowed us to keep the factory connection while keeping the interior of the ball smooth. This allows the exhaust to flow unrestricted through the "ball" joint. While this CNC solid stainless steel billet was very expensive to manufacturer, our motto at ER is "Performance, no compromises". Our in house testing showed that we did indeed have real world improvements with this new CNC billet "ball" joint and thus worth the extra costs. This is why the N26 downpipes do cost a little bit more than the N20 downpipes as the N20 downpipes do not have the ball joint system but use a traditional slip-fit design which is cheaper for us to manufacturer.
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.