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At lower revs and during cruise operation the valves are closed
all exhaust gases flow through the muffler
The dual-mode ECU-controlled valve exhaust from Akrapovic offers stock-level sound at normal cruising
Downpipe kit (Replaces catalytic converter)
Evolve Catless Turbo Downpipes - BMW 1 Series 135i | 1M | 3 Series 335i N54 E64 At lower revs and duringNOT ROAD LEGAL Evolve 3" catless turbo downpipes for the N54 1M 135i 335i in T301 Stainless steel. By eliminating the restrictive catalytic converters in the factory downpipes, back pressure is reduced significantly which results in faster spool, an increase in power & a more aggressive exhaust note. Features T301 Stainless Steel 3" Downpipe design with 2. 5" flange Gaskets and new bolts provided Fits both RHD and LHD Adds approx 10 BHP & 10 lb. ft
US$ 151.00
US$ 116.00
US$ 160.00