OKTAN
BMW S63 Sport Catalysts
$1,650.00
Made to order — ships in 10–14 days
Fits your vehicle
Check fitment
Lower driver-side corner of the windscreen, the sticker in the driver’s door jamb, or your registration / insurance card. It’s 17 characters — we decode it instantly and never store it.
- Custom-made to order — ships in 10–14 days
- Free tracked shipping across the USA
- Secure payment
- Fitment guarantee — we confirm before you buy
Emissions & off-road notice. Catless configurations are sold for closed-course competition and off-road use only and are not legal for street use on pollution-controlled vehicles. You are responsible for compliance with the emissions laws where you drive. Prefer a street-friendly setup? Choose a 200-cell high-flow configuration above.
High-flow S63 sport catalysts that fit them all. A direct bolt-on set of 200-cell metallic sport cats for the twin-turbo V8 BMW S63, TIG-welded from mandrel-bent 3.0" / 76 mm (per bank) T304 stainless and test-fitted in-house. Frees up flow while retaining emissions equipment.
Fitment — BMW S63 4.4T V8 (2018–present)
| Chassis | Models |
|---|---|
| F90 | M5 |
| F91 / F92 / F93 | M8 |
| F95 | X5 M |
| F96 | X6 M |
One set fits the current-generation S63 M-cars via the OEM mounting points.
Why owners choose OKTAN
- Faster spool & sharper throttle — less back-pressure, earlier boost.
- Deeper, more aggressive tone with no cabin drone at cruise.
- Unlocks your tune beyond the restrictive OEM catalyst.
- True bolt-on — no cutting or welding.
Specifications
- Material: T304 stainless steel
- Catalyst: 200-cell high-flow metallic sport cats (per bank)
- Piping: 3.0" / 76 mm per bank, mandrel-bent, back-purged TIG welds
- Set: twin-bank (V8)
- Flange: CNC-machined V-band
- Sensors: OEM O2 positions retained
- Warranty: lifetime against manufacturing defects
Made to order, free tracked US shipping, dispatched in 10–14 days. Fitment confirmed before you buy.
T304 StainlessAerospace-grade steel — never budget mild steel
True Bolt-OnFits the OEM mid-pipe — no cutting or welding
Flow-TestedEngineered & test-fitted in-house on real cars
Lifetime WarrantyCovered against manufacturing defects
Install at a glance
IntermediateDIY difficulty
2–4 hoursTypical time
Basic hand toolsSocket set & ratchet
Ramps or liftRaise & support safely
- Let the exhaust cool fully, then raise and support the car on stands or ramps.
- Soak the fasteners and O2 sensors with penetrating oil before removal.
- Transfer your O2 sensors to the new pipe — OEM sensor positions are retained.
- Seat the flange and tighten the V-band clamp evenly, then torque to spec.
- Running catless? Pair it with a supporting tune to manage fuel trims and the CEL.
- Every order is fitment-confirmed before it ships — stuck? We’ll walk you through it.
Complete the install
Customer reviews
4.9
/ 5
Verified purchase
Kept it street legal with the 200 cell and still gained great flow. No drone, no codes.
Verified purchase
Flows way better than stock without turning the car into a race exhaust. Very happy.
Verified purchase
Great compromise — louder and freer flowing but still comfortable on long drives.
Verified purchase
Perfect balance of sound and civility. Fitment on my car was spot on.