MO
Milltek Secondary Catalyst Bypass | BMW G8X M3 M4
SKU: SSXBM1342
Description
Milltek Axle Back Secondary Catalyst Bypass system for BMW G8X M3 and M4. Direct fitment 102mm single mid-pipe with X-pipe configuration. Non-resonated design for closed-course and track use. Connects to either OE axle back (SSXBM1342) or Milltek Cat-Back Axle Back (SSXBM1341).
Mandrel-bent T304L stainless steel construction with hand-finished welds. Removes secondary catalyst restrictions post-turbocharger for improved turbo efficiency and mid-range response. Engineered to work seamlessly with both OEM and Milltek exhaust systems. Uses OE mounting points and hangers—no modification required.
- Fits BMW G8X M3 (S58 engine) with OE or Milltek axle-back systems
- Fits BMW G8X M4 (S58 engine) with OE or Milltek axle-back systems
- Non-resonated: optimized for track and closed-course driving
- 102mm bore mandrel-bent X-pipe design
- T304L stainless, TUV tested for durability
Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.
Key Facts
| Pipe Diameter | 101.60 |
| 1.5 to 2 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 Secondary Cat Bypass | BMW G8X M3 M4
SSXBM1341MP
Total
$1236.92
$1001.91
$1236.92
$1001.91
MO
Milltek Secondary Catalyst Bypass | BMW G8X M3 M4
SSXBM1339MP
Total
$1171.65
$949.03
$1171.65
$949.03
Milltek 80mm OPF/GPF Back Exhaust | BMW G8X M3 M4
SSXBM1317MP
Total
$4827.84
$3910.54
$4827.84
$3910.54
MO
Milltek Non-Resonated Secondary Cat Bypass | BMW G8X M3 M4
SSXBM1268MP
Total
$1164.16
$942.97
$1164.16
$942.97
MO
Milltek Resonated Secondary Cat Bypass | BMW G8X M3 M4
SSXBM1267MP
Total
$1475.53
$1195.18
$1475.53
$1195.18
Best Sellers
Milltek Road+ Cat-Back Exhaust | VW Golf MK7.5 GTI
SSXVW470MP
Total
$1735.54
$1405.79
$1735.54
$1405.79
Milltek Race 80mm Cat-Back Exhaust | VW Golf MK8 GTI
SSXVW681MP
Total
$1448.78
$1173.51
$1448.78
$1173.51
MO
Milltek Valved & Non-Resonated Cat-Back Exhaust | Toyota GR Corolla 1.6T
SSXTY151MP
Total
$4272.51
$3460.73
$4272.51
$3460.73
EC
Milltek OPF/GPF Back Exhaust | Land Rover Defender 130 P300 P400e - Burnt Titanium Tips
SSXLR217
Total
$3710.76
$3005.71
$3710.76
$3005.71
Milltek Secondary Catalyst Bypass (Fits to OE System Only) | Porsche 958 Cayenne S 4.8 V8 (Non-Turbo)
SSXPO204
Total
$492.20
$398.68
$492.20
$398.68
MO
Milltek Secondary Catalyst Bypass (Fits to OE System Only) | Porsche Cayenne 958 Turbo 4.8 V8 (Pre-Facelift)
SSXPO182
Total
$492.20
$398.68
$492.20
$398.68
V2 Active Valve Control
SSXLO8
Total
$528.58
$428.15
$528.58
$428.15
Milltek Resonated Cat-Back Exhaust | VW Golf MK7 Alltrack 1.8TSI-Titanium Tips
SSXVW754
Total
$2111.11
$1710.00
$2111.11
$1710.00
Milltek Secondary Catalyst Bypass Exhaust | Ford Maverick 2.0T AWD
SSXFD547MP
Total
$202.98
$164.41
$202.98
$164.41
Milltek Secondary Cat-Back with Side Exit | Ford Maverick 2.0T AWD
SSXFD545MP
Total
$888.51
$719.69
$888.51
$719.69