Tailor-made exhausts.
Built for one car. Yours.
Hand-built by Brill-Steel in Italy, tuned and validated by S4T. Every system is bespoke — no catalog, no part numbers, just a custom exhaust built for your car.
Select your platform.
Choose a Brill-Steel-supported marque to view the exact vehicle list and build options.
Two workshops.
One obsession.
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Stage 4 Tuning is the exclusive worldwide distributor of Brill-Steel exhausts — handmade Italian exhaust systems designed and manufactured in Italy.
Brill-Steel has been building custom exhaust systems for over 30 years, pairing old-world fabrication with modern performance standards. Stage 4 Tuning brings that program to clients worldwide with fitment guidance, installation support, calibration, and dyno validation.
CAD design, material selection, mandrel bending, TIG welding under argon, heat treatment, laser-etched serialization. Every system signed.
Professional installation, ECU recalibration, full dyno sweep on our Mainline, backpressure testing, sound profiling.
An exhaust is not a part. It is the one organ a car cannot hide — the only voice it owns.
This is not a catalog. It is a private commission program between two workshops obsessed with the same question: what would a car sound like if someone built its exhaust for it — only it — by hand. The following pages document the work. Read it like a dossier.
Three Ferraris.
One commission.
An 812 Competizione, a 296 GTB, and an SF90 Stradale — matched in matte teal, a single white stripe, each on a bespoke Brill-Steel system. Photographed in the forecourt of the workshop where the cars were finished.
You don't pick a part number. You commission a system.
Not bolted to it.
Ferrari Daytona SP3
— fitted by hand.
Only 599 SP3s exist, each one wrapped around a 6.5L naturally-aspirated V12. A car this rare doesn't take catalog parts — the rear is sculpted around the original system, with no room for a generic bolt-on. Brill-Steel built ours around the firing order and the diffuser geometry. Tips sit flush. Flow stays clean. The silhouette doesn't change.
- Platform
- Ferrari Daytona SP3
- Engine
- V12 · 6.5L · naturally aspirated
- Production
- 599 worldwide
- System
- Bespoke, fitted to OEM diffuser
- Focus
- Flow, silhouette retention
- Tone
- High-rev V12 — uncompromised
— Naturally-aspirated twelves don't come around often. When one does, the system gets built by hand or it doesn't get built at all.
at dusk.
Ferrari Monza SP2
— the private barchetta.
A limited-series speedster, delivered without a windshield on purpose. Our brief from the client was simple: let the V12 6.5 breathe the way Maranello intended, and let the cabin feel the difference at every blip. The answer was a quad-exit system, tapered to the chassis.
- Platform
- Ferrari Monza SP2
- Engine
- V12 · 6.5L · naturally aspirated
- Output
- 799 hp · 530 lb·ft
- System
- Quad-exit system, Brill-Steel bespoke
- Saving
- −14 kg vs. OEM
- Finish
- Heat-blued tips · laser-etched
— A naturally-aspirated twelve deserves a system built in kind. Signed by the fabricator. Filed under 042.
01How does the exhaust commission process work?
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02What materials are used?
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03How long does a custom exhaust take?
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04What power gains can I expect?
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05Can you build for Porsche, Ferrari, McLaren, and Lamborghini?
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Your car deserves a
bespoke exhaust.
Tell us what you drive. We'll come back with a build sheet, sound samples, and a fixed quote within 48 hours.
No catalog. No compromise.
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