BMW M3 G80 / M4 G82 / M2 G87 | Heat-Shielded Stainless Steel 200-Cell Catted Downpipe

BMW M3 G80 / M4 G82 / M2 G87 Heat-Shielded Stainless Steel 200-Cell Catted Downpipe

Engineered for BMW M3 G80, M4 G82, and M2 G87 owners, this Heat-Shielded Stainless Steel 200-Cell Catted Downpipe optimizes post-turbine exhaust gas flow on the S58 platform. Imported from leading manufacturers around the world and quality-controlled by BYC Performance, it bolts directly to the OEM v-band flange, no welding required.

The 200-cell high-flow catalyst delivers a significant flow gain over the factory cat. The heat-shield coating reduces engine-bay temperature and protects intake air temps, improving turbine efficiency across the S58's 473-543 hp (M3/M4) and 460 hp (M2 G87) output range. The most balanced downpipe choice for daily performance.

Key Features

• 200-Cell High-Flow Catalyst: Significant flow gain over OEM.
• Heat-Shield Coating: Lowers engine-bay temps, protects intake air temperature, improves turbine efficiency.
• T304 Stainless Steel: Corrosion-resistant premium alloy, high-temperature rated.
• OEM V-Band Compatible: Bolts directly to factory flange, mates to mid-pipe or catback without modification.
• CNC-Bent Piping: Smooth internal surface, flow-optimized geometry.
• Turbine Flange Direct Fit: Matches S58 twin-turbo flange dimensions perfectly, leak-free.

200-Cell Catted vs. De-Cat Downpipe

This product is the 200-cell high-flow catted variant:

• 200-Cell Catted (this product): Road use and inspection rules depend on your car and where you drive.
• De-Cat (Catless): Maximum flow, more aggressive sound, but triggers CEL and requires a tune
• For daily driving: 200-cell preferred

Standard Geometry vs. Equal-Length

We offer the same material and catalyst in different geometry variants:

• Standard Geometry (this product): Direct flow path, more compact packaging, optimized for street performance.
• Equal-Length: Synchronized pulse waves from both turbines, cleaner high-RPM note and marginal hp gain, track-day oriented.

Installation Notes

Downpipe replacement requires lift access and turbine bay work; professional installation is required. General steps:

1. Lift the vehicle and remove the underbody shield.
2. Loosen the stock downpipe turbine flange bolts (disconnect lambda sensors).
3. Release the mid-pipe v-band clamp and remove the stock downpipe.
4. Install the new downpipe to the turbine flange with a fresh gasket and torque to spec.
5. Reinstall lambda sensors into the new downpipe bungs.
6. Tighten the mid-pipe v-band clamp (torque: 12 Nm).
7. Start the engine, check for leaks, and run an OBD scan for fault codes.

Care & Maintenance

T304 stainless and the heat-shield coating are high-temperature rated. Some smoke from the coating on first start is normal. Re-check turbine flange torque after the first 500 km.

FAQ

Does it require a tune?
A tune is not required.

Does it fit the M2 G87?
Yes. The shared S58 engine makes this downpipe fully compatible with the BMW M2 G87 Coupe (2023+).

Compatible with M3 / M4 Competition and CS / CSL?
Yes. All trims share identical turbine flange geometry.

Compatible with previous-gen F80 / F82?
No. S55-powered F-generation models use a different turbine flange; this downpipe is S58-only (G80/G82/G87).

Does it fit the M4 G83 Convertible?
Yes, fully compatible with the BMW M4 G83 Convertible (Cabriolet).

Shipping time?
In-stock items ship within 1-3 business days via partner couriers. Parts sourced to order are delivered within 30 days of the order date at the latest.

Warranty?
Manufacturing defects are covered by a 24-month BYC warranty, in addition to your legal rights.

Why BYC Performance?

BYC Performance is a Turkey-based performance tuning specialist sourcing premium parts from leading manufacturers around the world and supplying them to the Turkish market. Our catalog includes BMW M3 G80 downpipes, BMW M4 G82 catted downpipes, BMW M2 G87 downpipes, and many more high-quality S58 performance components.