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Frequency Intelligent Valvetronic Exhaust System technology offers our cutting-edge intelligent ECU exhaust control valve
superior to T-400 series knockoffs (such as 409)
BMW M4 F82 | F83 2015
independently functioning damping power adjustment
an exquisite high-performance car that can be made even better by adding an Akrapovič Slip-On exhaust system
H&R BMW F83 M4 Cabrio Sport Spring Carbon Fiber Frequency Intelligent Valvetronic Exhaust SystemEvery spring produced by H&R comes from the H&R ISO 9001 certified engineering and manufacturing facility in Germany. All H&R springs are produced from a special 54SiCr6 spring steel, which has strength rated at 290,000 psi resulting in unrivaled tensile strength and resiliency. H&R Sport Springs offer the handling characteristics and aggressive appearance that youve been looking for, without the harsh ride characteristics of less advanced spring
