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Supersprint front pipe with 100 CPSI metallic catalytic converter by HJS Motorsport
Because the secondary O2 sensors will read the wrong values once these components are fitted
Low end torque and top end power are the areas which improve the most and it is these very areas which need improvement
This intake is not just another cone filter with a heat shield
Evolve Catless Turbo Downpipes - BMW 1 Series 135i | 1M | 3 Series 335i N54 Evolve Downpipe Supersprint front pipe with 100NOT 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
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