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Over 40lbs of weight savings over the stock exhaust
5″ primary
428i & 435i with the N20
thus reducing lap times
and tested the entire intercooler in-house
ARM S55 Catless Downpipes Chassis:M4 Over 40lbs of weight savingsUpgrade 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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