Flashark Catless Downpipes for 2016-2021 BMW B48 (G/F Chassis) 120i/220i/230i/320i/330e/330i/420i/430i/630i/730i & xDrive

Unlock Maximum Performance: Flashark B48 Catless Downpipe Upgrade

The B48 2.0L TwinPower Turbo is BMW's workhorse four-cylinder — and the factory catalytic converter is the single biggest restriction in the exhaust path. On non-US market models, the OEM downpipe chokes exhaust flow right where the turbo needs to breathe, raising backpressure, slowing spool, and capping your power ceiling.

This Flashark catless downpipe replaces the factory cat section with a straight-through mandrel-bent stainless steel pipe, purpose-built for international B48-powered BMWs on G/F chassis platforms. The result: faster turbo spool, 25–30 WHP gains (with a Stage 2 tune), sharper throttle response, and a more aggressive exhaust note with deeper pops and burbles on deceleration — all without excessive cabin drone.

Non-US market only. Will NOT fit US-spec B48 vehicles. Will NOT fit models equipped with an OPF (Otto Particulate Filter). RHD models may require clearance adjustments around the steering column.

Key Features

Catless Straight-Through Design — Eliminates the factory catalytic converter, the B48's largest exhaust restriction. Unrestricted flow from the turbo outlet means faster spool, lower EGTs, and measurable power gains — especially above 3,000 RPM where the OEM cat is most restrictive

25–30 WHP Gains with Stage 2 Tune — Dyno-validated power increase when paired with a proper ECU tune (BM3, MHD, or bootmod3). The catless downpipe + tune is the single highest-ROI modification on the B48 platform

Mandrel-Bent Stainless Steel Piping — Smooth radius bends maintain consistent inner diameter through every curve — no crush-bent restrictions, no turbulence pockets. TIG-welded joints for leak-free sealing under boost

Direct Bolt-On for LHD Models — Precision-engineered to replace the factory downpipe using OEM mounting points and flange patterns. No cutting, no welding, no fabrication required on Left-Hand Drive models

Universal Cat-Back Compatibility — Bolts to both the stock OEM cat-back and all aftermarket exhaust systems (Akrapovič, Remus, Armytrix, etc.). No adapter needed
Pre-Welded O2 Sensor Bungs — Factory O2 sensors thread directly into the pre-welded bungs at the correct depth and position. No drilling, no welding — simply transfer the sensors from the stock pipe

Aggressive Exhaust Note — The catless design unlocks the B48's turbo spool whistle and deeper exhaust tone. More aggressive on throttle, sporty pops and burbles on deceleration — without the highway drone that plagues poorly designed systems

Specifications:

• Brand Name: Flashark
• Certificate: ISO9001:2000
• Application: Exhaust Downpipe Performance Upgrade
• Material: High-Quality Stainless Steel
• Surface: Precision-Finished
• Model: FLJN-EXS22-00043003
• Construction: Handcrafted, TIG-Welded Joints; Mandrel-Bent Piping
• Compatibility: Works with stock catback and all aftermarket exhaust systems

Shipping Information:

• Delivery Time: 3–5 business days
• Shipping: Free Shipping

Warranty & Return Policy:

- Duration of Warranty: 1 Year
- Return Policy: Items can be returned within 14 days of receipt
- Satisfaction Guarantee: "No Hassle" fitment and performance guarantee