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2 Resonators
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5mm Allen Key insert for easy install
This effectively eliminates porosity and aligns the grain structure of the metal
ARM G8x M3/M4 S58 4.5" Single Midpipe f93 m8 2 ResonatorsHIGHLIGHTS Exotic Exhaust Sound Massive 4. 5" Design SS304 Stainless Steel Saves 15lbs Over OEM PROFILE The ARM S58 4. 5" Single Midpipe upgrade is designed to unleash the incredible exhaust sounds from your G8X M3 M4. By removing the secondary catalysts and two middle resonators, the ARM S58 Midpipe substantially improve the sound of your S58 powered BMW. Also, by retaining the OEM muffler, you still have the ability to control the exhaust valves,
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