HKSTUDIE Exhaust System - BMW M3/M4 G80/G81/G82 Competition

Upgrade your G80/G81/G82 M3/M4 Competition with the HKSTUDIE EX001 — Japanese-crafted stainless steel exhaust system that blends refined cruiser tone with real performance gains. Compatible with S58B30A engine (2021-on) for 2WD and 4WD models.

Fitment & Application

• Designed exclusively for the BMW M3/M4 G80, G81, G82 Competition models (engine S58B30A, from 2021 onwards).
• Code: HKSTUDIE-EX001.
• Quad-exit tail tips, SUS304 construction, minimum ground clearance ~135 mm at mid-pipe.

Performance & Engineering Highlights

• Exhaust flow resistance is claimed to be up to 35% lower compared with OEM layout thanks to optimized pipe routing and the removal of the centre-resonator.
• In internal testing on a stock vehicle, HKSTUDIE measured a gain of up to +5 kW (≈+6.7 hp) and +15 Nm torque over OEM when the system is fitted.
• Sound tuning is grounded in frequency-analysis: unwanted low-frequency drone (below ~100 Hz) is suppressed, while the more sporty mid-frequency (200 Hz+) exhaust tone is emphasised.
• Despite the aggressive design, the system is certified under UN-ECE R51.03 Phase 2 noise regulation (Japan) — making it suitable for everyday driving and compliant with inspection regimes.

Design & Visuals

• Tail tip styling takes cues from the legendary BMW 3.0 CSL – thick-walled slash-cut quad tips with blasted finish and internal sound-insulating slits for premium aesthetic and acoustics.
• Full system manufactured in-house in Japan, with precise TIG welding by experienced “takumi” craftsmen for durability and fit/finish excellence.

Installation & Warranty

• Bolt-on installation (no structural modifications implied) – though you may wish to check compatibility with local regulations and any ECU tune interplay.
• 2-year / 30,000 km product warranty from date of purchase.

Why choose HKSTUDIE EX001 for your M3/M4 Competition?

• Real measurable performance improvement without major engine changes — ideal for both road-use and spirited driving.

• Premium build quality using SUS304 stainless steel, extensive development and Japanese craftsmanship.

• Thoughtful acoustical tuning: you get the aggressive sporty note when you want it, yet avoid unwanted cabin drone during cruising.

• Visual upgrade at the rear — quad tips and premium finish elevate your M’s aesthetics.

• Regulatory compliance for many markets (including Japan) means peace of mind for daily use.

Specifications at a glance

• Material: SUS304 stainless steel

• Tail tip outer diameter: Ø101.6 mm (quad exit)

• Flow improvement: up to ~35% lower exhaust resistance vs OEM.

• Power gain: up to +5 kW; torque +15 Nm (per manufacturer internal testing).

• Ground clearance (lowest part): approx. 135 mm at #2 mid-pipe.

• Noise level (near-field): HKSTUDIE system ~97 dB vs OEM ~94 dB in testing.

Important notes & fitment tips

• Ensure you specify your exact model, engine code and drivetrain (2WD vs 4WD) when ordering — this system is engineered for the Competition variant (375 kW / 510 PS) of the G80/G81/G82.

• Some markets may have additional noise/emissions regulations. While R51.03 Phase 2 compliant in Japan, please check local compliance requirements, especially for registration/inspection.

• If you run additional tuning (flash, downpipes, etc) or aftermarket mid-pipes, you may amplify performance gains beyond the quoted figures.

• Upon installation, check for clearance (especially if you’ve lowered the vehicle) and monitor for any difference in cabin levels or drone — though HKSTUDIE have engineered to minimise drone.

• Periodically inspect welds and tail tips for finish, especially if in harsh environments (salt, high humidity) — though SUS304 helps with corrosion resistance.