EC
Milltek Hi-Flow Sports Cat | Audi RS3 8V
SKU: SSXAU771
Description
ECE-approved hi-flow sports cat designed for European road use (R103 compliant). T304L stainless steel construction with 200–300 cell density provides unrestricted exhaust flow without requiring ECU recalibration or triggering diagnostic codes. Direct fitment with OEM cat-back systems and Milltek cat-back exhausts.
Hand-finished T304L stainless steel core with CNC-formed housings. EC Type Approval ensures full street legality across Europe. No software modifications required—bolt-on installation using existing hangers and O2 sensor locations.
Fitment:
- Compatible with OEM factory cat-back systems
- Compatible with Milltek cat-back exhaust systems
- Retains OE oxygen sensor and diagnostics
- No ECU tune or check engine light risk
Engineered for sustained flow and reliability on both road and circuit.
Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.
Key Facts
| Pipe Diameter | 63.55 |
| 3 to 3.5 hours to fit (including removing OE system) | |
| Race Product | No |
| EMarked | Yes |
System Fitment List
Shipping Information
This system ships in 1 box.
Similar Products
RacingLine Higher Output Ignition Coil / EA8XX
VWR900001MP
Total
$51.79
$51.79
RacingLine Stage 3+ Carbon Brake Kit / 380mm 6 Pot / MQB & MQBE - Anodised
VWR651000-ANO
Total
$8888.88
$8888.88
RacingLine 18" x 8.5" R-06 Wheel / ET44 / 57.1mm
VWR610400MP
Total
$531.32
$531.32
RacingLine 18" x 8.5" R-06 Wheel / ET44 / 57.1mm
VWR610400MP
Total
$531.32
$531.32
RacingLine Door Decals Short / Golf / Polo / Leon / A3 S3 RS3
VWR800001MP
Total
$56.57
$56.57
Best Sellers
Milltek Race 80mm Cat-Back Exhaust | VW Golf MK8 GTI
SSXVW681MP
Total
$1448.78
$1448.78
Milltek HJS Hi-Flow Sports Cat (w/ Heat Wrap) | Chevrolet C8 Corvette Z06
SSXCH111
Total
$3321.28
$3321.28
MO
Milltek Secondary Catalyst Bypass (Fits to OE System Only) | Porsche Cayenne 958 Turbo 4.8 V8 (Pre-Facelift)
SSXPO182
Total
$492.20
$492.20
Forge Intake Kit | 2025+ Ford Maverick and Bronco Sport 2.0T EcoBoost
FMINDK65-PLE
Total
$335.98
$335.98
Milltek Secondary Catalyst Bypass Exhaust | Ford Maverick 2.0T AWD
SSXFD547MP
Total
$202.98
$202.98
Milltek Secondary Catalyst Bypass (Fits to OE System Only) | Porsche 958 Cayenne S 4.8 V8 (Non-Turbo)
SSXPO204
Total
$492.20
$492.20
Milltek Valved Axle-Back Exhaust | Dodge Charger Sixpack H/O 3.0T Hurricane
ENQ-CHG-ABV-MP
Total
$1845.32
$1845.32
MO
Milltek Secondary Catalyst Bypass | Audi RS3 8V Dual Catalyst Systems
SSXAU588
Total
$330.63
$330.63
MO
Milltek Large Bore Downpipe with HJS Hi-Flow Cat - NO CEL | VW Golf MK8 R
SSXVW672MP
Total
$1837.19
$1837.19
Milltek Cat-Back Exhaust | Dodge RAM 1500 Rebel
SSXRAM109MP
Total
$1937.77
$1937.77