KREISSIEG FIRST CAT-BACK F1 SOUND VALVETRONIC EXHAUST SYSTEM STAINLESS STEEL FLOATING CURL TAIL SANDBLASTED KSG LOGO MARK FOR BMW E60 M5 BME60-03-STAINLESS

 

KREISSIEG FIRST CAT-BACK F1 SOUND VALVETRONIC EXHAUST SYSTEM STAINLESS STEEL FLOATING CURL TAIL SANDBLASTED KSG LOGO MARK FOR BMW E60 M5 BME60-03-STAINLESS

This is one of the most extreme, purpose-built exhaust systems ever associated with the E60 M5, specifically exploiting the character of BMW’s 5.0-liter S85 naturally aspirated V10. 

Kreissieg’s own documentation identifies the system as its E60 M5 First Cat-back F1 Sound Valvetronic system. 

🔧 What exactly is BME60-03-STAINLESS?

Feature	Specification
Car	BMW E60 M5
Engine	5.0L S85 V10
System	First cat-back
Construction	Stainless steel
Tail design	Floating Curl Tail
Tail diameter	4 x 84 mm
Valve system	Kreissieg Laser Wolf V.T.
Control	Wireless remote
Sound modes	5 selectable levels
Manufacturing	Hand-built in Japan
Build time	Typically 14–20 days
Product code	BME60-03-STAINLESS

The current listing specifies the standard configuration as Level 2 Silent Mode / Level 5 F1 Mode. 

🧠 Why this exhaust is special

The clever part isn’t simply “valves = louder.”

Kreissieg designs the muffler architecture and exhaust-path characteristics specifically to manipulate the frequency content and character of the S85’s exhaust pulses. The company has historically emphasized different metals, thicknesses and internal muffler design as part of its sound engineering. 

Think of it as:

S85 V10 → exhaust pulse architecture → Kreissieg muffler → valve-controlled acoustic path → dramatically different sound signatures

That’s why this system has a reputation for producing an unusually high-pitched motorsport-like V10 scream, rather than simply making the M5 louder.

🎚️ Five-stage acoustic philosophy

Kreissieg specifies five sound levels:

Level 1 → approximately stock character
Level 2 → quiet/sporty
Level 3 → louder, higher-pitched sports tone
Level 4 → very loud, high-pitched F1-style character
Level 5 → extreme, super-high-pitched F1-style sound 

The famous L2/L5 configuration therefore gives the E60 M5 two personalities:

Valves closed: refined V10 GT
↓
Valves open: aggressive high-RPM V10 scream

A real-world installation report similarly describes the closed mode as surprisingly quiet and the open mode becoming dramatically more high-pitched as RPM rises, particularly above roughly 4,000 rpm. 

🏎️ Why the E60 M5 is such a perfect match

The S85 is an unusually good candidate for this type of exhaust because its character is fundamentally different from a turbocharged modern engine.

S85 V10 characteristics:

• Naturally aspirated
• 5.0 L
• 10 cylinders
• Very high rev limit
• Individual throttle bodies
• Strong high-RPM harmonic content
• Rapidly changing exhaust frequency with RPM

So instead of trying to manufacture an exotic sound from a turbocharged engine, Kreissieg is essentially amplifying an already exotic acoustic source.

That is why the combination is legendary.

⚙️ Performance vs sound

This is important: don’t buy BME60-03 primarily for horsepower.

Its major engineering objective is sound character and controllability, rather than being a maximum-power race exhaust.

Kreissieg’s official E60 M5 information specifically describes the system around its valve-controlled sound characteristics, while the manufacturer also cautions that its complex system isn’t recommended for race application. 

So I’d classify it:

Sound: ⭐⭐⭐⭐⭐
Drama: ⭐⭐⭐⭐⭐
Acoustic sophistication: ⭐⭐⭐⭐⭐
Street usability: ⭐⭐⭐⭐☆ with valves closed
Maximum-power focus: ⭐⭐⭐☆☆
Exotic character: ⭐⭐⭐⭐⭐

🏁 BME60-03 vs a normal E60 M5 exhaust

A conventional performance exhaust generally follows:

More flow → less restriction → louder/deeper sound

Kreissieg takes a more elaborate approach:

Muffler architecture + material characteristics + exhaust routing + valve control → different acoustic personalities

That’s the reason this isn’t just an expensive “loud exhaust.”

It is closer to an acoustic engineering system for the S85 V10.

🔥 The ultimate E60 M5 character

If you imagine the E60 M5 hierarchy:

OEM exhaust
→ sophisticated V10

Sport exhaust
→ louder, sharper V10

Kreissieg BME60-03
→ V10 transformed into an extremely high-frequency motorsport-style acoustic experience

And the Floating Curl Tail + sandblasted KSG logo gives the rear of the E60 a distinctly old-school Japanese high-end tuning aesthetic.

Current Japanese retail listings show the stainless BME60-03 at ¥767,800, with a titanium version separately listed at ¥833,800. 

The verdict:

The BME60-03-STAINLESS isn’t the exhaust I’d choose if the only objective were maximum horsepower. 

I’d choose it if the objective were to make the E60 M5/S85 V10 one of the most acoustically outrageous naturally aspirated cars possible while retaining selectable quiet and aggressive modes.

For an E60 M5 enthusiast, the combination of S85 V10 + SMG + Kreissieg F1 valvetronic is about as close as you can get to turning the E60 into a road-going V10 orchestra with a “race mode.”

KREISSIEG FIRST CAT-BACK F1 SOUND VALVETRONIC EXHAUST SYSTEM STAINLESS STEEL FLOATING CURL TAIL SANDBLASTED KSG LOGO MARK FOR BMW E60 M5 BME60-03-STAINLESS

ENDLESS REAR INCH UP KIT SYSTEM INCH UP KIT REAR FOR AUDI RS3 (8V) SEDAN EEZ8YRS38V

 

ENDLESS REAR INCH UP KIT SYSTEM INCH UP KIT REAR FOR AUDI RS3 (8V) SEDAN EEZ8YRS38V

The ENDLESS Rear Inch-Up Kit System, part number EEZ8YRS38V, is essentially a rear-axle brake upgrade that increases rotor size while retaining the factory rear caliper architecture. 

ENDLESS lists the RS3 (8V) Sedan as an application for its rear Inch-Up system, with a 332 × 22 mm two-piece rotor. 

🧠 Technical breakdown

Area	Stock concept	ENDLESS Rear Inch-Up
Position	Rear	Rear
Rotor	OEM-size	332 x 22 mm
Construction	OEM	2-piece performance rotor
Caliper	Factory rear caliper retained	Factory caliper retained
Main upgrade	Standard thermal capacity	Greater thermal capacity & consistency
Unsprung mass	OEM baseline	Optimized 2-piece construction
Purpose	Road/OEM balance	Fast road + track-oriented braking

The clever engineering is that this isn’t simply “put a bigger brake on the back.” The kit uses an adapter arrangement to position the original rear caliper farther outward, allowing it to work with the larger rotor. 

This preserves the factory parking-brake arrangement while increasing the disc’s effective thermal capacity. 

🔥 Why the 332 mm rotor matters

The important physics is:

Brake torque ≈ caliper clamping force × effective rotor radius

Increasing rotor diameter increases the effective braking radius, so the same caliper force can generate more braking torque.

But the bigger advantage on a hard-driven RS3 is heat management.

ENDLESS’s own RS3 replacement-disc testing shows its two-piece 370 × 34 mm front disc can produce substantially different temperature behavior versus the OEM disc, illustrating why ENDLESS focuses heavily on rotor construction and cooling. 

The rear Inch-Up therefore complements a serious front brake upgrade rather than trying to turn the rear axle into the dominant braking axle.

⚙️ Why retain the OEM rear caliper?

This is actually a very intelligent approach for an AWD performance car like the RS3.

The rear brakes have several jobs:

Deceleration → stability → ABS control → electronic brake-force management → parking brake

Making the rear caliper dramatically larger can disturb the carefully engineered front/rear brake balance.

ENDLESS instead increases the rotor’s mechanical leverage and thermal capacity while keeping the factory rear caliper architecture.

That gives you:

larger rotor → greater thermal mass → improved heat resistance → more consistent braking → less risk of rear-brake imbalance.

🏁 Best configuration

For an aggressively driven RS3 8V, the interesting ENDLESS combination is:

Front: Racing MONO6 + 380 × 34 mm 2-piece rotor
Rear: Inch-Up + 332 × 22 mm 2-piece rotor

ENDLESS’s vehicle catalogue specifically lists this combination for the RS3 8V Sedan. 

The front Racing MONO6 uses a forged monoblock caliper and is designed around a 380 × 34 mm two-piece rotor for this RS3 application. 

🏆 My assessment

EEZ8YRS38V is a very sophisticated upgrade rather than a conventional BBK.

Street: ⭐⭐⭐⭐⭐
Fast road: ⭐⭐⭐⭐⭐
Track: ⭐⭐⭐⭐⭐
Thermal management: ⭐⭐⭐⭐⭐
OEM integration: ⭐⭐⭐⭐⭐
Rear brake balance: ⭐⭐⭐⭐⭐

The biggest attraction is engineering efficiency: rather than replacing everything, ENDLESS upgrades the part that most directly improves rear-axle thermal capacity—the rotor—while maintaining the factory caliper system.

For an RS3 8V quattro, I’d regard this as particularly attractive when paired with a serious 380 mm front ENDLESS system, rather than installing the rear kit alone.

ENDLESS REAR INCH UP KIT SYSTEM INCH UP KIT REAR FOR AUDI RS3 (8V) SEDAN EEZ8YRS38V