HAW Exhaust Downpipe for M2 G87 / M3 G80 G81 / M4 G82 G83

HAW Exhaust System

Every HAW exhaust is engineered as a complete system — from the downpipe to the mid and rear sections — ensuring proper airflow, sound, and thermal balance throughout.

Downpipe

Four things that set us apart from the vast majority of downpipe brands on the market:

1. High-Flow Catalytic Converter with Advanced Coating — High-flow catalytic substrate with an additional catalytic coating. Reduces back pressure and unlocks power, while keeping you emissions-compliant and road-legal in Australia.

2. Anti-Smell Treatment — A specialised treatment applied to the substrate that significantly reduces the sulphur smell common during cold starts with high-flow downpipes. Your garage shouldn't smell like a race track.

3. Full Thermal Wrap — Completely wrapped in high-performance insulation material to reduce engine bay temperatures, protect surrounding wiring and hoses, and keep heat within the exhaust flow for improved turbo response.

4. No Check Engine Light — Tested and verified to work with factory ECUs and mainstream tunes without triggering fault codes. No repeated resets, no surprise warning lights on your dash.

All four of the above are standard. No optional extras. No additional cost.

Mid & Rear Section

The mid and rear section is responsible for sound. Hand TIG-welded, direct OEM-position fitment with no cutting or welding required. Custom pipe diameter and tip options are also available.

Every HAW exhaust — pipe diameter, bends, welds, coating, insulation, sound tuning — is produced to our own standard. Not generic. Not rebadged. Not backyard weld work.

Please note: This product is available for pre-order. Estimated dispatch within 2 weeks of order.