BMW Catless Downpipes Guide — S55, S63, B58 & N55 | Pricing, Power Gains & Fitment (2026)
Catless downpipes are one of the highest-impact bolt-on modifications for turbocharged BMW engines. By removing the restrictive factory catalytic converters, exhaust gas exits the turbocharger housing with significantly less backpressure — meaning the turbo spools faster, exhaust gas temperatures drop, and the ECU has more headroom to add power when paired with a Stage 2 tune.
YPG Motorsport stocks catless, 200-cell and 400-cell high-flow catted downpipes for every major BMW performance engine — from the S55 inline-6 in the M3/M4 to the S63TU twin-turbo V8 in the M5 and M6, plus the B58 single-turbo six powering the 240i through 640i and the N55 in the original M2. This guide breaks down what to expect from each platform, pricing, fitment and the tune pairing you need.
BMW Catless Downpipe Options — Catless vs 200-Cell vs 400-Cell
Before diving into individual engine platforms, it's important to understand the three downpipe options YPG Motorsport offers for most BMW models. Each variant delivers different levels of power, sound and emissions compliance.
| Spec | Catless | 200-Cell High-Flow | 400-Cell GESI |
|---|---|---|---|
| Catalyst | None — full decat | 200 cells/in² metallic | 400 cells/in² GESI substrate |
| Power Gain (w/ Stage 2) | Maximum — +30–50 HP | Within 5 HP of catless | Within 10 HP of catless |
| Exhaust Smell | Strong sulphur odour | Mild — greatly reduced | Minimal — near stock |
| Sound Level | Loudest — raspy, aggressive | Moderate — deeper than stock | Subtle — refined tone |
| Check Engine Light | Yes — requires tune | Yes — requires tune | May pass with spacer |
| Best For | Track / race builds | Street + occasional track | Daily driver / inspection regions |
BMW S55 — M3 F80 / M4 F82 / M2 Competition
The S55 3.0L twin-turbo inline-6 is the backbone of BMW's F8x M-car lineup. With catless downpipes and a Stage 2 ECU tune, expect +30–40 HP over stock. The S55 runs two small-frame turbos with integrated wastegates, so reducing exhaust restriction has a direct effect on spool speed and mid-range torque.
The downpipes bolt on identically across the F80 M3, F82 M4 Coupe and F83 M4 Convertible — same exhaust routing, same hardware. Installation takes approximately 3–4 hours on a lift.
| Model | Engine | Catless Price | 200-Cell Price | 400-Cell Price | HP Gain (Stage 2) |
|---|---|---|---|---|---|
| M3 F80 | S55 3.0TT I6 | $899.99 | $1,899.99 | $2,499.99 | +30–40 HP |
| M4 F82 / F83 | S55 3.0TT I6 | $899.99 | $1,899.99 | $2,499.99 | +30–40 HP |
| M2 Competition F87 | S55 3.0TT I6 | $899.99 | $1,899.99 | $2,499.99 | +30–40 HP |
BMW S63TU — M5 F90 / F10 M5 / M6 F1x / X5M / X6M
The S63 and S63TU 4.4L twin-turbo V8 power BMW's heaviest hitters. Catless downpipes on these platforms unlock +35–50 HP with a Stage 2 tune. The F90 M5 kit includes midpipes for a complete front exhaust decat — the most comprehensive setup YPG offers for the S63TU4.
Important: Despite sharing the S63 engine family, the F85 X5M, F86 X6M, F10 M5 and F1x M6 all have chassis-specific exhaust routing. Each requires its own downpipe set — they are not interchangeable.
| Model | Engine | Catless Price | 200-Cell Price | 400-Cell Price | HP Gain (Stage 2) |
|---|---|---|---|---|---|
| M5 F90 + Midpipes | S63TU4 4.4TT V8 | $1,999.99 | $2,999.99 | $3,599.99 | +40–50 HP |
| M5 F10 | S63TU 4.4TT V8 | $999.99 | $1,999.99 | $2,599.99 | +35–45 HP |
| M6 F06 / F12 / F13 | S63TU 4.4TT V8 | $999.99 | $1,999.99 | $2,599.99 | +35–45 HP |
| X5M F85 | S63 4.4TT V8 | $1,500 | $2,500 | $3,099 | +35–45 HP |
| X6M F86 | S63 4.4TT V8 | $1,500 | $2,500 | $3,099 | +35–45 HP |
BMW B58 — 240i, 340i, 440i, 540i, 640i, X4 M40i
The B58 3.0L single-turbo inline-6 is BMW's most versatile modern engine. Catless downpipes add +25–35 HP with a Stage 2 tune across all B58-equipped models. Because the B58 uses a single, larger turbocharger, reducing exhaust restriction improves peak power and extends the power band through the upper RPM range.
The exhaust routing is shared across the F-series B58 lineup, making fitment straightforward regardless of body style. The 240i, 340i, 440i, 540i, 640i and X4 M40i all use compatible downpipe geometry.
| Model | Engine | Catless Price | HP Gain (Stage 2) | Notes |
|---|---|---|---|---|
| 240i F22 | B58 3.0T I6 | $999 | +25–35 HP | Lightest B58 chassis — best power-to-weight |
| 340i F30 | B58 3.0T I6 | $999 | +25–35 HP | Most popular B58 platform |
| 440i F32 / F36 | B58 3.0T I6 | $999 | +25–35 HP | Coupe and Gran Coupe fitment |
| 540i G30 | B58 3.0T I6 | $999 | +25–35 HP | 5 Series executive with 400+ HP potential |
| 640i G32 | B58 3.0T I6 | $999 | +25–35 HP | 6 Series Gran Turismo |
| X4 M40i F26 | B58 3.0T I6 | $999 | +25–35 HP | SAV crossover — same exhaust path |
BMW N55 — M2 F87
The original M2 runs the N55 3.0L single-turbo inline-6 — a proven platform that responds predictably to exhaust modifications. Catless downpipes add +20–30 HP with a Stage 2 tune. The single-turbo layout means gains are concentrated in the mid-range where the N55 already excels.
Note: The M2 N55 and M2 Competition S55 are completely different exhaust systems. Make sure you select the correct downpipe for your engine.
| Spec | Stock M2 F87 | Stage 1 (Stock Hardware) | Stage 2 (Catless DP) |
|---|---|---|---|
| Power | 365 HP | 415 HP | ~430–440 HP |
| Torque | 500 Nm | 570 Nm | ~600–620 Nm |
| HP Gain | — | +50 HP | +65–75 HP |
| Required Hardware | — | None — stock hardware | Catless or high-flow downpipe |
| ECU Tune | — | Stage 1 — $1,299 | Stage 2 — required |
Complete BMW Catless Downpipe Price List
Every BMW downpipe YPG Motorsport offers at a glance — catless, 200-cell and 400-cell variants with current pricing. All kits include hardware, gaskets and a lifetime warranty.
| Model | Engine | Catless | 200-Cell | 400-Cell |
|---|---|---|---|---|
| M3 F80 | S55 | $899.99 | $1,899.99 | $2,499.99 |
| M4 F82/F83 | S55 | $899.99 | $1,899.99 | $2,499.99 |
| M5 F90 + Midpipes | S63TU4 | $1,999.99 | $2,999.99 | $3,599.99 |
| M5 F10 | S63TU | $999.99 | $1,999.99 | $2,599.99 |
| M6 F06/F12/F13 | S63TU | $999.99 | $1,999.99 | $2,599.99 |
| X5M F85 | S63 | $1,500 | $2,500 | $3,099 |
| X6M F86 | S63 | $1,500 | $2,500 | $3,099 |
| 240i F22 | B58 | $999 | — | — |
| 440i F32/F36 | B58 | $999 | — | — |
| 540i G30 | B58 | $999 | — | — |
| 640i G32 | B58 | $999 | — | — |
| X4 M40i F26 | B58 | $999 | — | — |
| M2 F87 | N55 | $699.99 | $1,699.99 | $2,299.99 |
Do BMW Catless Downpipes Require a Tune?
Yes — every platform. Removing the catalytic converters without an ECU tune will trigger a persistent check engine light (CEL) from the rear O2 sensor monitoring. More importantly, without recalibrating the fuelling and ignition maps, you leave power on the table.
A Stage 2 tune from YPG Motorsport includes cat-delete parameters, optimised boost targets and revised ignition timing to extract the full benefit of reduced exhaust restriction. Every YPG tune is delivered remotely via YPG Flash — our OBD port flashing service that works worldwide.
| Engine | Stage 2 Tune | Price | HP Gain (w/ Downpipes) |
|---|---|---|---|
| S55 (M3/M4) | Stage 2 S55 Tune | $1,799 | +120 HP |
| S63TU (M5/M6) | Stage 2 S63TU Tune | $1,799 | +150 HP |
| S58 (G8x M3/M4) | Stage 2 S58 Tune | $1,499 | +277 HP |
| N55 (M2 F87) | Stage 1 N55 Tune | $1,299 | +50 HP |
Installation & Shipping
All YPG Motorsport BMW downpipes are mandrel-bent stainless steel, direct bolt-on replacements with no cutting or welding required. Installation typically takes 3–4 hours on a lift for inline-6 models and 4–5 hours for V8 platforms.
| Detail | Info |
|---|---|
| Material | 304 stainless steel, mandrel-bent |
| Fitment | Direct bolt-on — OEM mounting points, includes gaskets & hardware |
| Install Time | 3–4 hours (I6) / 4–5 hours (V8) on a lift |
| Warranty | Lifetime warranty on all downpipe kits |
| GCC Delivery | 2–5 business days via FedEx / DHL from Kuwait |
| International | 5–10 business days worldwide |
Questions? WhatsApp YPG Motorsport for fitment confirmation and tune pairing recommendations.
BMW Catless Downpipes — FAQ
Do catless downpipes void my BMW warranty?
What is the difference between catless and 200-cell downpipes?
Will catless downpipes throw a check engine light?
Can I install catless downpipes without a tune?
Are S55 M3 and M4 downpipes interchangeable?
Do B58 240i, 340i, 440i, 540i downpipes all fit the same?
How much horsepower do catless downpipes add to a BMW?
Do you ship BMW downpipes to the UAE, Saudi Arabia and Qatar?
Related BMW Performance Guides
- BMW M2 F87 Downpipe Guide — Catless, 200-Cell & 400-Cell
- BMW N55 Tuning Guide — Stage 1 & Stage 2 Power Gains
- BMW N54 Tuning Guide — Stage 1 & Stage 2 Gains
- BMW M3/M4 G80/G82 S58 Tuning Guide
- Lamborghini Huracán V10 Tuning Guide
- Mercedes-AMG C63 W205 Tuning Guide
- Porsche 992 Turbo / Turbo S Tuning Guide
- Audi RS6 / RS7 C8 Tuning Guide
BMW ECU Tuning & Downpipes in the GCC
YPG Motorsport is the GCC's specialist for BMW performance tuning. Based in Kuwait with worldwide shipping and remote ECU flashing, we serve BMW owners across the Gulf region: