S58 Midpipe For BMW G80 M3, G82 M4, G83 M4 Including Competition - ARM Motorsports explorer_tuning N54 JB4 Tuner Features &

N54 JB4 Tuner Features & Benefits

• ARM S55  Single Exit Exhaust Midpipe Extension

Stage 1 + Stage 2: 450 LPH @ 72psi

uses the OEM cold air inlet

Audi JB4 Mobile demo video

S58 Midpipe For BMW G80 M3, G82 M4, G83 M4 Including Competition - ARM Motorsports explorer_tuning N54 JB4 Tuner Features &The ARM S58 Midpipe upgrade is engineered to unlock the aggressive exhaust character of your G80 M3 or G82 M4. By removing the secondary catalytic converters and the two center resonators, this midpipe significantly enhances the sound of your S58 powered BMW. At the same time, it retains the factory muffler, so you can still control the exhaust valveskeeping them closed for a quieter, refined tone or opening them for maximum volume and performance