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The integrated velocity stack smooths the airflow from the large filter into the charge system with excellent laminar properties
It is compatible with all COBB OTS Maps and Stage Power Packages
COBB Tuning Light Weight Hoodie
bar and plate core
Not applicable for xi all wheel drive models
VRSF 4" Cast Stainless Steel Racing Downpipe | E89 Z4 28i MK1 e-tron Triple Motor The integrated velocity stack smoothsWe are proud to introduce our VRSF Catless Downpipe for your 2011+ BMW Z4 sDrive28i. This downpipe is THE best bang for the buck mod available. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is reduced significantly which results in faster spool, an increase in power & a more aggressive exhaust note. Our catless downpipes are hand crafted from mandrel bent SS304 grade stainless steel and the turbo flange is
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