MO
Milltek Resonated Secondary Cat Bypass | BMW G8X M3 M4
SKU: SSXBM1269
Parts
Documents
Description
Milltek Axle Back Resonated Secondary Cat Bypass for BMW G8X M3 and M4. Direct fitment to OE downpipes and OE axle-back systems. Hand-finished T304L stainless steel construction with 3.00" (76.20mm) mandrel-bent piping engineered to optimize exhaust flow while preserving factory integration points.
This resonated design eliminates secondary catalyst restriction while maintaining acoustic balance through OE resonance point engineering. Uses factory hangers and mounting locations—no modification required. T304L material resists thermal cycling corrosion common in secondary cat applications.
Fitment & Installation
- BMW M3 G80 (2021+) and BMW M4 G82/G83 (2021+)
- Fits OE downpipes only
- Fits OE axle-back systems only
- Direct factory fitment—no welding, cutting, or modification
- OEM hanger and sensor compatibility
Milltek secondary cat bypasses are engineered alternatives to full cat-back systems for buyers seeking midpipe performance gains without replacing the entire system.
Fits OE system.
Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.
Key Facts
| Pipe Diameter | 76.20 |
| 2 to 3 hours to fit (including removing OE system) | |
| Race Product | Yes |
| EMarked | No |
System Fitment List
Shipping Information
This system ships in 1 box.
Similar Products
MO
Milltek Z-Pipe Upgrade for Secondary Catalyst Bypass | BMW G8X M3 M4
SSXBM1430
Total
$780.00
$780.00
MO
Milltek Z-Pipe Secondary Catalyst Bypass | BMW G8X M3 M4
SSXBM1424MP
Total
$1679.87
$1679.87
MO
Milltek Secondary Cat Bypass | BMW G8X M3 M4
SSXBM1341MP
Total
$1228.36
$1228.36
MO
Milltek Secondary Catalyst Bypass | BMW G8X M3 M4
SSXBM1339MP
Total
$1163.09
$1163.09
MO
Milltek HJS Large Bore Downpipe | BMW G87 M2, G80 M3, G82 M4
SSXBM1333MP
Total
$3638.00
$3638.00
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