HKSTUDIE EXHAUST for BMW G87 6MT

HKSTUDIE EXHAUST for BMW G87 6MT

 Combines gentle yet powerful sound
 Sound regulation compliant

HKSTUDIE EXHAUST SYSTEM

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Name:HKSTUDIE EXHAUST for BMW G87 6MT

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Model:BMW G87 M2 3BA-12DM30

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MSRP:JPY700,000-

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Code No.:HKSTUDIE-EX003
Make:BMW G87 M2
Model Year:2023-
Engine:S58B30A
Packing Dimensions (mm):C/No.1: 1,515 x 600 x 335 C/No.2: 1,161 x 460 x 290
Weight (kg):39 (C/No.1: 25 C/No.2: 14)
JAN Code:4957266941232

　

　

– FEATURES –

A one-of-a-kind tail tip design

A specially designed tail tips paid homage to the legendary “BMW 3.0 CSL“. It has a thick-walled slash-cut tail tips, emphasizing the texture of the edges, and the surface is blasted to express a dull glossy finish. Features a sound deadening inner slits to create a one-of-a-kind tail tip design.

Gentle yet powerful sound

The OEM exhaust of the G8X generation M produces a sporty sound that is distinctive of the M series. Since replacing only the main muffler does not produce a significant change in sound, the HKSTUDIE exhaust features a layout that deletes the middle muffler. The unique sound tuning based on frequency analysis has achieved gentle yet powerful sound.

Compliant with Japan’s vehicle inspection regulations

Although it gives off a powerful sound, it still meets the strict sound regulation in Japan. This products can be used safely for daily use and is compliant with Japan’s vehicle inspection regulations.

Reduce exhaust pressure by up to 40%

Optimized pipe layout and a main muffler without restrictions reduce exhaust pressure by up to 40% compared to the OEM muffler. This results in increased boost responsiveness and higher output at high RPM range and increases power output by up to 5kw and torque by up to 35Nm.

 A 2-year or 30,000 km product warranty

By manufacturing in-house at our factory in Japan and conducting strict quality control, we are able to offer a 2-year or 30,000 km product warranty from the time of purchase.

　

– CONFIGURATION –

Certification Number	JQR10257016　S58B30At
Main Material	SUS304
Tail Tips Outer Diameter	101.6mm　(Quad Exit Style)
Main Pipe Diameter	70mm×2→(70mm+60.5mm)×2
Sound Level (OEM)	82dB (idle: 62dB)
Sound Level (HKS)	95dB (idle: 66dB)
Minimum Ground Clearance	137mm (#2 Mid Pipe)

　

– PERFORMANCE –

 Flow Bench Testing – 40% lower exhaust resistance (max.)

　

 Power/Torque Curve

　

Increases output ＋5kw and torque +35Nm

Lowering exhaust pressure leads to higher engine power output. As shown in the graph below, the response of the turbo boost is improved in the low rpm range, and torque is increased by up to 15Nm. As for power output, the better exhaust flow leads to more power at higher engine speeds, increasing the power by up to 5kw.

All tests at our headquarters were conducted using vehicles in stock condition except for the exhaust system. The difference in power output between OEM and HKSTUDIE exhaust systems will widen further when the ECU is analyzed and tuned to increase power output.

　

 Sound Features

Exhaust sound tuning based on frequency analysis

HKSTUDIE produced numerous prototypes of mufflers and conducted a thorough frequency analysis. Especially for the G87M2, the sound pressure tends to be higher overall due to the shorter exhaust pipe length compared to the M3/M4, and the silencer structure was designed specifically for the M2 to muffle the targeted frequency range in order to keep within the regulation values.

General exhaust with internally constructed mufflers will have a marked drone sound (see the graph below, around 100 Hz), while the HKSTUDIE is able to muffle the low-frequency sound just like an OEM exhaust. This drone sound is especially noticeable when cruising at 80km/h on highways.

　

In addition, the HKSTUDIE exhaust is tuned to emphasize a mid-frequency sound above 200 Hz, which is considered a sporty sound, when the engine is revved to high rpm at full throttle (see the graph below, 200-600 Hz).

Thanks to its gentle sound during cruising, the driver and passengers will not feel any discomfort, and once the driver steps on the gas pedal, they will enjoy the powerful sound.

　

Exhaust Sound Level

The following are in-house measurements of the exhaust sound level, which is a reference for the volume of the exhaust system. Compared to the OEM exhaust and the HKSTUDIE exhaust system.

dB(A)	Left		Right
	Partial Throttle	Throttle Off	Partial Throttle	Throttle Off
OEM/Efficient /ValveOn	79.1	82.2	80.4	82.4
OEM/Sport+ /ValveOn	80.5	83.4	82.4	83.3
HKSTUDIE /Efficient/ValveOn	89.5	95.3	92.8	93.9
HKSTUDIE/Sport+ /ValveOn	90.2	97.8	88.2	98.2

　

　

– DETAILS –

　

– REMARKS –

 Japanese Exhaust Noise Regulation

This product has been tested and certified by an organization registered by Japanese Minister of Land, Infrastructure, Transport and Tourism for noise testing based on their pre-certification system for replacement exhaust systems and has received the “Performance Verified Label” as proof of certification.

Certification number: JQR10257016　S58B30At

The proximity exhaust sound level of a vehicle equipped with a muffler certified under this system is measured in a default engine mode and exhaust valve mode when the engine is started. (In case of G87 6MT, measurement is carried out in Engine Mode: Efficient, Exhaust Valve On)

The noise regulation values are subject to the “April 2010 New Regulations on Silencers”. Measured rpm of proximity exhaust noise is 75% of the rpm of maximum power output. (4,687 rpm for G87 6MT)

As shown in the figure on the right, the microphone should be positioned at the exhaust tip farthest from the vehicle’s centerline.

ALL PICTURES SHOWN ARE FOR ILLUSTRATION PURPOSE ONLY. UNAUTHORISED REPRODUCTION AND DISTRIBUTION IS STRICTLY PROHIBITED. ACTUAL PRODUCT MAY VARY DUE TO PRODUCT ENHANCEMENT.