Competition Series 4" Downpipe for X1/X2/2 Series Gran Coupe/Mini with B46/B48 Engine

Competition Series 4" Downpipe for X1/X2/2 Series Gran Coupe/Mini with B46/B48 Engine

Name: Competition Series 4" Downpipe for X1/X2/2 Series Gran Coupe/Mini with B46/B48 Engine
Brand: Modded Mini
SKU: BM-EXH021CAT-1
Price: 445.0 USD
Availability: InStock

$445.00

Shipping calculated at checkout.

Finish

Brushed

Polished

EGT Bung

Add EGT Bung

No thanks

Model Year

2016-08/2020

09/2020+

Free worldwide shipping

Low stock - 5 items left
Backordered, shipping soon

Competition Series 4" Catless Downpipe

For BMW B46/B48 2.0L Turbo Engines

Fits:

2016+ BMW X1 / X2
2020+ 2 Series Gran Coupe
MINI Cooper S, Clubman, Cabrio, and Countryman
(U.S.-spec B46 and B48 engine only – Not interchangeable with B48 EU/Asia-spec)

Maximum Flow. Maximum Power.

Introducing our Competition Series 4" Downpipe—the ultimate upgrade for your turbocharged BMW B46 or B48-powered MINI. Designed for performance enthusiasts who want unrestricted exhaust flow, instant throttle response, and faster turbo spool-up, this is the most aggressive downpipe we offer.

Remove the bottleneck—the factory downpipe with its restrictive catalytic converter—and unleash your engine’s true potential.

Real-World Performance Gains

Based on dyno testing with a stock turbo setup:

+14 to 16 WHP peak horsepower gains
+20 WTQ average (stock boost)
Up to +24 WTQ with a software tune
Faster turbo spool = less lag
Sharper, more immediate throttle response
Broader torque curve = more usable power across RPM band

Unlike “peak-only” gains, our downpipe produces real-world, seat-of-the-pants performance, where it matters—throughout the powerband.

Premium Construction & Flow-Focused Design

100% 304 stainless steel
Mandrel-bent 4" tubing for optimal flow
100% TIG welded by in-house fabricators
CNC-machined billet 304 stainless V-band flange to match the turbo
True 4" outlet—no necked-down restrictions at the flange
Smooth reduction further from turbo = minimal turbulence
Stainless flex bellow for OEM-like movement and long-term durability
Mirror polish or brushed finish options available

Unlike competitors that cheat by stepping down to 3" at the turbo flange, we deliver a full 4" flow path all the way from the turbo outlet before gradually transitioning to 3". That means more power and smoother exhaust flow.

Durability That Goes the Distance

BMW includes a flex section in the factory design to protect the turbo, manifold, and entire exhaust system from vibration, impact, and thermal expansion. So do we.

Our fully stainless steel flex bellow ensures proper exhaust system movement, reducing wear and preventing cracking—especially on lowered vehicles where the risk of impact is greater.

Many competitors skip this. We don’t.

Thermal Management Options

Optional: Black Ceramic Thermal Coating

Rated up to 2000°F
Reduces underhood temps
Improves exhaust gas velocity
Increases corrosion resistance

Sensor Add-ons for Tuners

Optional: Additional O2 Sensor Bung

Ideal for adding a wideband sensor
Pre-installed with removable plug

Optional: EGT Sensor Bung

1/8" NPT port for Exhaust Gas Temp gauge
Comes with pre-installed plug

Fitment & Compatibility

Compatible with both factory and aftermarket exhaust systems
Retains factory heat shields
Includes all hardware for bolt-on installation
Track-tested and proven
Backed by a Limited Lifetime Warranty
Proudly made in the USA

Ready to maximize your BMW or MINI’s performance? The Competition Series Catless Downpipe is the answer.

***On xDrive / all wheel drive models, there is a driveshalf running from the transfer case to the rear differential that the standard front wheel drive cars do not have. This driveshaft sits right underneath the downpipe and blocks the removal. On a typical installation, you would need to disconnect the driveshaft (requires special driveshaft tool) or lower the front subframe to give enough clearance to remove the downpipe. This add significant installation time and complication to the installation. Our solution is the 2 piece xDrive version allows you to remove and install the downpipe without removing the driveshaft or lowering the front subframe. This will save you considerable time (money) on installation and allows quicker, easier servicing.***

Use collapsible tabs for more detailed information that will help customers make a purchasing decision.

Ex: Shipping and return policies, size guides, and other common questions.

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Testimonials

Had my 21 JCW DME cloned and tuned by Abel. excellent support throughout the entire process from beginning to completion. The car drives well with linear torque in every gear! Sure beats femto unlock.

Fred

Abel was quick to help me out and answer my questions via Email. I made an appointment with Abel to unlock and tune my 23 S. He showed up happy to help, and we got it knocked out in a few hours. It was a night and day difference, and I highly recommend this company to all mini Gen3 owners.
Canaan

Modded Mini developed new upgrades for our 2021 Mini GP3 race cars. At the first race of the season, we experienced some technical difficulties related to fuel. Abel was able to figure out and fix the issue in no time “ 20 min “ over the computer at the track. He knows we will be racing over the weekend, and his dedication and standing behind his product speak for themselves. Our team achieved P1 and P2!

Mira