Maximize the performance of your B46 engine with this premium downpipe. Catless or high-flow cat options are available. +15 HP and +25 Nm of power gain. Suitable for all F and G chassis models with a B46 engine from 2016-2021. Perfect for Stage 2+ tuning.
Advantages
- +15HP and +25Nm power gain
- Catless or high flow cat options
- Stainless steel construction – durable and reliable
- Improved turbo spool and throttle response
- Direct bolt-on – uses OE mounting points
Material & Construction
This downpipe is made of high-quality stainless steel (T304) with TIG-welded connections. It's available in catless (maximum flow) or high-flow cat (200-cell sports catalyst) versions. Both options are optimized for maximum flow and minimal backpressure.
The downpipe replaces the restrictive OE catalytic converter and significantly improves exhaust flow. This results in a power gain of +15 HP and +25 Nm, better turbo spooling, and improved throttle response. Suitable for all F and G chassis models with the B46 engine: 120i, 220i, 230i, 320i, 330e, 330i, 420i, 430i, 630i, 730i, and xDrive variants from 2016-2021. Stage 2 tuning required.
Installation & Assembly
The downpipe is a direct bolt-on replacement. Remove the original downpipe and catalytic converter. Install the new downpipe using the original mounting points. Use new gaskets and bolts. Stage 2 tuning is required to prevent CEL (check engine light) and achieve optimal performance. Professional installation is highly recommended.
Key specs: T304 stainless steel construction, TIG-welded, catless/high-flow cat options, +15 HP +25 Nm, weight approximately 2 kg, suitable for B46 F/G chassis 2016-2021. Stage 2 tuning required. Note: Catless not legal for street use in some countries.
Technical Specifications
| Material
|
Stainless steel T304 |
| Options
|
Catless, high flow cat (200 cell) |
| Capital gains
|
+15HP +25Nm |
| Engine
|
B46 (2016-2021) |
| Suitable for
|
120i, 220i, 230i, 320i, 330e, 330i, 420i, 430i, 630i, 730i |
| Weight
|
2kg |
| Tuning
|
Stage 2 required |
Maintenance & Warranty
Check the fasteners and gaskets regularly. Replace the gasket if leaks occur. High-flow cathode can become contaminated over time; clean if necessary. Stainless steel can discolor due to heat; this is normal.
This product is covered by the manufacturer's warranty against material and manufacturing defects. Damage due to improper installation or excessive use is not covered by the warranty.
Frequently Asked Questions
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Catless or high flow cat? Catless = max flow, high flow = 200 cell sport cat (legal).
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Do I need tuning? Yes, Stage 2 tuning is required for CEL and optimal performance.
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How much power will I gain? +15 HP and +25 Nm with Stage 2 tuning.
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Does this fit the 330e? Yes, it fits all B46 models, including the 330e.
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How long does delivery take? In stock, immediate delivery available.
