VRSF Ceramic Coated Downpipe Upgrade N55 2010 – 2013 BMW 135i/335i/X1The VRSF 3. 5 downpipe upgrade is THE best bang for the buck mod available for your N55 135i & 335i xi. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is significantly reduced which results in faster spool, an increase in power & a more aggressive exhaust note. Our downpipe also features a unique CFD optimized cast merge collector which offers the smoothest turbo to mid pipe transition available. Every VRSF
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