2012-UP BMW N26 320i 328i 420i 428i Turbo Competition Series 4" Catless Downpipe

BM-EXH010

Competition Series 4" Downpipes for your N20 four cylinder turbo engine!  Fits all 2012+ 320i, 328i, 420i, 428i with the N26 engine (does not fit N20 engine)

SHOWN WITH BRUSH FINISH
FOR POLISH FINISH: PLUS $50 from PRICE ABOVE (CHOOSE FROM OPTION)
FOR BLACK THERMAL COATING: PLUS $100 from PRICE ABOVE (CHOOSE FROM OPTION)

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.

Key Features:

• Now available for the 2012+ BMW 328i/320i/428i/420i N26 Engines!
• Horsepower gains of 14 to 16whp average (gains will vary based on modifications of your vehicle).
• Higher Max Horsepower Power Curve
• Torque gains of 16wtq average (stock boost) up to over 24 wtq (Software upgrade) (gains will vary based on modifications of your vehicle).
• Higher Intial Torque Curve.  Torque curve hits faster and higher and longer.
• Better throttle response and faster turbo spool up times.
• Mandrel Bent 4" 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.
• Precision CNC machined ball joint flange with straight flow interior (versus factory press formed ball joint)
• Stainless steel flex section like factory that allows proper exhaust movement and flexibility.
• Mirror polish or brush 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)
• Retains the factory "ball" type v-band connector.
• Improved design of "ball" connector for better flow characteristics over factory connector.
• Compatible with the factory or aftermarket exhaust systems.
• Track tested durability.
• Includes all hardware for complete installation.

Shown with brushed 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" Catless Downpipe, more power is unleashed!  Our dyno testing has shown around 14-16whp average peak gains and upwards of 24wtq peak gains!  While peak horsepower is nice to look at on dyno charts, what's more important is the power curve.  If you look at the dyno charts, torque hits MUCH earlier and harder.  The torque curve is BROADER throughout the RPM band.  More usable power.  You have more time spent in the RPM band with higher horsepower and torque.  This equates to faster turbo spool up (less turbocharger lag) and better throttle response.  Bottom line, faster.  You will feel the difference instantly. 

 

Blue Line - Stock Baseline

Red Line - BMS JB4 Tuning

Green Line - BMS JB4 Tuning with Evolution Racewerk Downpipe

Thin Line - Stock Baseline

Thick Line - Evolution Racewerks Downpipe and Intake (Stock Tune)

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 2.5", the factory downpipes reduces size using short transitions from 4" before the catalytic convert and 2.5" 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).

Stainless Steel CNC Machined O2 Sensor Bungs and Laser Cut Brackets

The factory downpipe utilizes a flex bellow section that allows the exhaust system to move.  This eliminates undue stress on the exhaust components like the exhaust system, downpipe, turbocharger and exhaust manifold.  Many of our competitors do not feel it is important to keep this.  While you do not see any adverse affects right away, over time, the stresses caused by not having a flex section and having a rigid exhaust system will cause premature wear and tear.  Any stress failures like cracks will form quicker than usual on exhaust manifolds and exhaust components.  Also, without a flex section, the exhaust system cannot properly deflect impact.  Especially on lowered cars, whenever the exhaust system contacts the ground, the entire system gets pushed up.  Without a flex, you can imagine how much stress is put into exhaust components like the exhaust manifold when the exhaust is pushed upwards.  We fully understand that durability of our products is important.  Thus, like BMW, we incorporate a flex section into our downpipe.  Our flex sections are 100% stainless steel (cheap flex sections only have stainless steel center braids and steel caps) to ensure corrosion resistance. 

100% Stainless Steel Flex Bellow Section

One of the main features of our N26 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.  The pictures below show the factory "ball" joint cut in half (to show in the interior) versus our CNC solid stainless steel billet "ball" joint.