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head-turning sounds your S55 will make under part and full throttle
Billet CNC OEM throttle body flange for a leak free connection
5″ primary
thus reducing lap times
and tested the entire intercooler in-house
ARM S55 Catless Downpipes Chassis:M4 head-turning sounds your S55 willUpgrade the performance of your M2 Comp, M3, or M4 with a set of ARM Catless Downpipes! HIGHLIGHTS Up to +30whp 30wtq Enhanced Exhaust Note 304 Stainless Steel Improved Turbo Spool PROFILE The ARM S55 Downpipes are the ultimate solution for improving power, throttle response, and exhaust note on your S55 powered M4. Our goal for the ARM M4 Downpipes was to provide a solution that would maximize power and torque, fit perfectly, and sound extraordinary.
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