Evolution Racewerks ER BMW Mini B46 Competition Series 4" Catless Downpipe UK | X1 X2 Mini Cooper S Decat Downpipe | Part No. BM-EXH021
Unlock serious performance with the Evolution Racewerks ER Competition Series 4 inch Catless Downpipe for the BMW B46 turbocharged four cylinder engine. This 4" decat downpipe is engineered for maximum exhaust flow, faster turbo spool, sharper throttle response and proven horsepower and torque gains. Perfect for BMW X1 X2 B46 and MINI B46 owners seeking a high quality stainless steel turbo downpipe upgrade for track and off road use.
We run ER hardware on our own cars and our customers love the fit, finish and results. If you are searching for BMW B46 downpipe, Mini Cooper S B46 downpipe, 4" catless downpipe, decat downpipe, turbo downpipe upgrade or ER downpipe UK, this is the Competition Series solution you want.
Why choose the ER 4" Catless Downpipe for B46
- Real power gains: 14 to 16 whp average and 20 to 24 wtq depending on supporting mods and software
- Quicker turbo spool and stronger, earlier torque hit for faster acceleration
- Higher, broader power curve for usable performance across the rev range
- Massive 4 inch mandrel bent stainless piping with smooth transition to the exhaust system
- 100 percent 304 stainless steel construction, 100 percent TIG welded
- Precision CNC machined turbo V-band flange to match the factory 4 inch outlet
- True 4 inch inlet and 4 inch pipe near the turbo to avoid turbulence and back pressure
- Stainless flex section for proper movement and OE-like compliance
- Retains factory heat shields, compatible with factory or aftermarket cat-back exhausts
- Track tested durability with Limited Lifetime Warranty
- Available finishes: mirror polish or brush, plus optional black high temperature thermal coating
Part Number
BM-EXH021
Fitment and compatibility
- BMW X1 F48 B46 2016+
- BMW X2 F39 B46 2016+
- MINI B46 Mini Cooper S F55 F56 2016+
- Also available for Mini B46 Clubman, Cabrio and Countryman where applicable
xDrive AWD version for easier installation
On xDrive models the front driveshaft runs under the downpipe and normally requires driveshaft removal or subframe lowering. The ER two piece xDrive version allows removal and installation without touching the driveshaft or subframe, saving time and labour while making future servicing easier.
How it makes power
The factory catalytic converter is a major restriction. Its dense honeycomb core slows exhaust velocity and creates turbulence right after the turbocharger. Replacing the stock downpipe with the ER Competition Series 4 inch catless downpipe removes that bottleneck, increases flow, lowers back pressure and improves energy retention in the exhaust stream. The result is faster turbo spool, improved throttle response and significant horsepower and torque gains you can feel immediately.
Construction details
- CNC machined 4 inch V-band turbo flange from billet 304 stainless steel
- O2 sensor positioned in the factory location
- Laser cut brackets and stainless hardware included for a complete install
- Retains OE heat shields and integrates cleanly with OEM or performance exhausts
Options
- Ceramic Thermal Coating Keeps exhaust heat inside the pipe to reduce under bonnet temperatures and maintain exhaust gas velocity, improving flow and adding corrosion resistance. Rated to 2000°F. Black finish.
- Additional O2 Sensor Bung Add a bung for a wideband O2 sensor. Supplied with a pre-installed plug if not used immediately.
- Optional EGT Bung Add a 1/8 inch NPT bung for an Exhaust Gas Temperature sensor. Supplied with a pre-installed plug.
Buy with confidence from Nforcd
Nforcd is your UK performance parts specialist for BMW and MINI tuning. We stock and support Evolution Racewerks ER downpipes and have installed them on customer cars with outstanding results and consistent fitment. If you are searching for BMW X1 downpipe, BMW X2 downpipe, MINI Cooper S downpipe, B46 decat pipe or 4 inch turbo downpipe UK, we can help you choose and fit the right setup.
Professional fitting available
We offer installation at Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Important notes
- B46 vs B48 The B46 engine is found in all U.S. spec cars and differs from the B48 found in EU and Asia spec cars. These downpipes are not interchangeable. Ensure you order for your engine code.
- Off road use only This catless downpipe is intended for off road competition use only. Not legal for use on public roads or pollution controlled vehicles.
Keywords for search
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