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The F30 series platform of the BMW 335I and 435I turbocharged engine is just as amazing to tune and gain performance like its predecessor, the E90 | E92 335I.  With any turbocharged vehicle, get the turbos to breathe better before and after them is the key to achieving more power with additional tuning.  One of the biggest "corks" in an exhaust system of a turbocharged car is the downpipe.  For emissions purposes, factory catalytic converters and downpipes can be restrictive.  However to still maintain a clean environment, using a high flow catalytic converter with a larger diameter piping will allow the exhaust gases to not bottleneck.  The new Agency Power high flow cat downpipe for the F30, F32, F33 BMW does just that.  The Metal Core Catalytic Converters have been designed to provide a reliable solution to the most common converter problems experienced by other brands with out having an absorbanent cost.  They are considered a 300cell but as bench tested, flow more than the HJS 200 cell cat.  Each cat is full stainless steel construction, including the substrate which is furnace braised to the mantle for outstanding durability.  They feature a unique end-cap design so it can’t rattle around.  The GESI proprietary precious metal loading technology used in these catalytic converters ensures greatly reduced emissions, eliminating most “Check Engine Light” issues.  With the catalytic converters mounted straight to the turbos, these are capable of withstanding up to 1500F which is about the EGT temperature at full power.  Made in the USA, the all stainless steel pipe is hand TIG welded in a fixture for perfect fitment, everytime.  

Downpipe is available in regular stainless steel or can be black ceramic coated to reduce temperatures for an additional cost.  All Agency Power products come with a limited lifetime warranty when you fill out the form here.