High-performance stainless steel exhaust system from HKSTUDIE, purpose-built for the BMW M2 G87 Pre-LCI 8-speed AT. Up to 40% less back-pressure, +5 kW gain, +35 Nm torque, refined sporty sound while staying compliant with Japanese acceleration noise regulation.

• Designed specifically for the G87 M2 (3BA-12DM30) built 2023/3 → 2024/9. 

• Code: EX004 (JAN 4957266941249)

Key Highlights

Tail Design & Finish
Inspired by the legendary BMW 3.0 CSL, the dual tailpipes are slash-cut with a deep-edge finish and blasted surface for a subtle high-end sheen. Internal slits in the tail section optimise sound, giving you a unique exhaust note that stands out. 

Sound Engineering
While many “sport” systems sacrifice refinement for volume, HKSTUDIE went deeper: using frequency-analysis and custom internal silencing they’ve managed to combine sporty character at high RPMs with quiet, comfortable cruising. The system passes Japanese acceleration noise regulations (R51-03) and features optimized layout with no restrictive mid-silencer. 

Performance Gains

• Exhaust back-pressure reduced by up to 40% compared to stock. 

• Dyno results: +5 kW peak power, +35 Nm peak torque (tested on stock vehicle except exhaust). 

• Flow-bench confirmed enhanced exhaust flow and boost-response improvement. 

Construction & Quality

• Made in Japan in HKSTUDIE’s own facility under strict process control. 

• Material: SUS304 stainless steel. 

• Tailpipe outer diameter: Ø101.6 mm (dual). 

• Pipe layout: Ø70×2 → Ø70×2 + Ø60.5×2 (optimized flow). 

• Minimum ground clearance: 137 mm (at 2nd mid-pipe section). 

• Includes full compliance certification and noise plate (JARI10250004P S58B30A) registered at 103 dB. 

• 2-year or 30,000 km product warranty. 

Vehicle Fitment

• Model: BMW M2 G87, Pre-LCI (8-speed automatic)

• Chassis / Model code: 3BA-12DM30

• Engine: S58B30A

• Production years: March 2023 – September 2024 (8AT model only) 
  Note: This system may not fit 6MT or LCI (later) versions — please contact us if your vehicle differs.

Why Choose This Exhaust?

• Purpose-engineered for the G87 M2, not a “one-size-fits-many” kit.

• Real world dyno and flow-bench data show measurable performance gains.

• Street-friendly sound: refined cruising, bold when you push.

• Built from premium materials in Japan with strong warranty backing.

• Compliant with Japanese noise regulations — offering peace of mind for inspections.

Installation & Usage Notes

• Professional installation recommended.

• Retain all removed OE parts until you confirm fitment and operation.

• After installation, allow for warm-up and check for any exhaust leaks or abnormal heat routing.

• If you have performance tuning (ECU remap, downpipes, etc), you may see greater gains than published figures.

• Ensure sufficient clearance from road surfaces and track-use obstacles (minimum 137 mm ground clearance at specified point) to avoid damage.