OVERVIEW
The aFe POWER MACH Force-Xp cat-back is a full 3 IN to 2-1/2 IN mandrel-bent 304 stainless steel exhaust system for the S58-powered BMW M3 and M4. An integrated mitered merge X-pipe balances and evenly distributes exhaust pulses through the system, minimizing drone while maximizing scavenging, and a high-flow stainless steel muffler unleashes the available horsepower and torque with an aggressive tone.
The system incorporates factory-style exhaust valves that reuse the vehicle's factory exhaust valve motors, so valve control behaves as it does with the OE system. State-of-the-art computer-aided design gives precise vehicle fitment, the whole system is 100% TIG-welded for race-proven strength, and factory-style hangers mount it to the factory locations. Some cutting may be required — see the instruction sheet before starting.
Finishing the system are quad 4 IN diameter clamp-on 304 stainless tips carrying the aFe POWER logo, available in polished, black or carbon fiber.
SPECS
- Tubing: 3 IN to 2-1/2 IN mandrel-bent 304 stainless steel
- Muffler: high-flow stainless steel; muffler finish may vary
- Exhaust tips: quad 4 IN diameter clamp-on 304 stainless steel with aFe POWER logo
- Tip finishes: polished (49T25404-P06), black (49T25404-B06), carbon fiber (49T25404-C07)
- Integrated mitered merge X-pipe for pulse balancing and drone reduction
- Factory-style exhaust valves — uses the factory exhaust valve motors (not included)
- 100% TIG-welded
- Computer-aided design for precise vehicle fitment
- Mounts to factory locations using factory-style hangers
- Some cutting may be required — see the instruction sheet
- Emissions: this product does not require a CARB EO#
PARTS INCLUDED
- 1x X-pipe (05-245307)
- 1x Driver side mid-pipe (05-245308)
- 1x Passenger side mid-pipe (05-245309)
- 1x Driver side tailpipe (05-245310)
- 1x Passenger side tailpipe (05-245311)
- 1x Muffler assembly (05-245312)
- 4x Exhaust tips — polished (49T25404-P06), black (49T25404-B06) or carbon fiber (49T25404-C07) depending on the part number ordered
- 2x 2-3/4" band clamps (05-41160)
- 4x 3" V-band clamps (05-41588)
- 2x 2-1/2" V-band clamps (05-410196)
TECH RESOURCES
Required Extras
- Factory exhaust valve motors — required and not included. This system uses factory-style valves driven by the vehicle's existing OE exhaust valve motors, which must be transferred from the factory exhaust.
- Customer-supplied tools and consumables: standard metric hand tools, a saw or cut-off tool (some cutting may be required), and a vehicle lift or jack stands.
Installation
- aFe POWER 49-36351-B / -C / -P installation instructions (PDF) — official aFe manual, covers all three tip finishes.
PART NUMBER
- 49-36351-B — MACH Force-Xp cat-back with black tips
- 49-36351-C — MACH Force-Xp cat-back with carbon fiber tips
- 49-36351-P — MACH Force-Xp cat-back with polished tips
VEHICLE APPLICATIONS
| Make / Model | Chassis | Engine | Years |
|---|---|---|---|
| BMW M3 / M3 Competition | G80 | S58 3.0L Twin-Turbo I6 | 2021–2026 |
| BMW M4 / M4 Competition | G82 | S58 3.0L Twin-Turbo I6 | 2021–2026 |
Fitment follows aFe's official installation manual, which lists G80 M3 and G82 M4 (including Competition, RWD and xDrive). Earlier store copy also listed the G83 M4 Competition convertible — confirm G83 fitment with Speed Logic before ordering.