Maximize the performance of your B58 engine with this premium 5.2-inch downpipe. Slip-on clamp design for easy installation. Catless or high-flow cat options. +15 HP and +25 Nm power gain. Suitable for F and G-chassis models with B58 engines (non-OPF and F-series OPF).
Advantages
- +15HP and +25Nm power gain
- 5.2 inch diameter – maximum flow
- Slip-on clamp type – easy installation
- Catless or high flow cat options
- Stainless steel construction – durable and reliable
Material & Construction
This downpipe is made of high-quality T304 stainless steel with TIG-welded connections. The 5.2-inch diameter ensures maximum flow and minimal backpressure. The slip-on clamp design makes installation easy without the hassle of welding. Available in catless (maximum flow) or high-flow cat (200-cell sports catalyst) versions.
The downpipe replaces the restrictive OE catalytic converter for significantly improved exhaust flow. This results in a power gain of +15 HP and +25 Nm, better turbo spooling, and improved throttle response. Suitable for F-chassis (M140i, M240i, 340i, 440i) and G-chassis (540i, 640i, 740i) with a B58 engine. Compatible with non-OPF and F-series OPF models. 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 with the slip-on clamp. Use a new gasket. Stage 2 tuning is required to prevent CEL (check engine light) and achieve optimal performance. Professional installation is highly recommended.
Key specifications: T304 stainless steel construction, TIG-welded, 5.2-inch diameter, slip-on clamp type, catless/high-flow cat options, +15 HP +25 Nm, weight approximately 2 kg, suitable for B58 non-OPF and F-series OPF. Stage 2 tuning required. Note: Catless is not legal for street use in some countries.
Technical Specifications
| Material |
Stainless steel T304 |
| Diameter
|
5.2 inches (132mm) |
| Type
|
Slip-on clamp |
| Options
|
Catless, high flow cat (200 cell) |
| Capital gains
|
+15HP +25Nm |
| Engine
|
B58 (non-OPF, F-series OPF) |
| Weight
|
2kg |
| Tuning
|
Stage 2 required |
Maintenance & Warranty
Check the slip-on clamp and gasket regularly. If leaks occur, replace the gasket or tighten the clamp. 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
-
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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What is a slip-on clamp type? Simple installation with a clamp, no welding required.
-
Does this fit G-series OPF? No, only non-OPF and F-series OPF models.
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How long does delivery take? In stock, immediate delivery possible.
