ApexBuilt® BMW G80 M3 & G82 M4 Mini-Cat Downpipes (S58, 2021+)

From £1,406.00
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Our unique O2 sensor housing design allows for a direct bolt-on installation, without resulting in a check engine light – even on otherwise fully stock cars. 

ApexBuilt® G8X M3/M4 Mini-Cat Downpipes offer...

• Perfect fitment, guaranteed. 

• No check engine light, no error codes. No tune required. 

• Without resonators

• Drastically improved throttle response, quicker turbo spool, and an aggressive exhaust note.

• Estimated gains of 20-25+ wheel horsepower and 40-50+ TQ when installed on a vehicle that is not tuned.

• Estimated gains of 60+ HP and 100+ TQ over stock power levels when paired with an aftermarket ECU tune.

• T304 stainless steel construction 

• Lifetime warranty



These these parts are for OFF ROAD / RACE USE ONLY . They are not 50 state legal. Any of our catless race downpipes WILL NOT be sold in, or shipped to, the state of California. We advise you to run a tune on your vehicle for best results.


• 18329501471 (Cyl. 1-3)
• 18329501472 (Cyl. 4-6)

Fitment supported for the following vehicles:

BMW M2 Automatic Coupe 2023

BMW M3 Comp. M xDrive Sedan 2022+

BMW M3 Competition Sedan 2021+

BMW M3 CS Sedan 2023
BMW M3 Sedan 2021+

BMW M4 Comp. M xDrive Coupe 2022+

BMW M4 Competition Convertible 2022+

BMW M4 Competition Coupe 2021+

BMW M4 Coupe 2021+

BMW M4 CSL Coupe 2023