3.5" Stainless Steel Downpipe with High-Flow Cat

The CTS Turbo 3.5″ Stainless Steel Downpipe with High Flow Cat is engineered to replace the restrictive factory downpipe on your MK2 VW Tiguan or Audi Q3 AWD. The stock downpipe is a significant bottleneck for exhaust flow, negatively impacting horsepower, particularly when the vehicle is tuned. This high-flow cat downpipe allows exhaust gases to exit more smoothly, potentially freeing up additional power and enhancing the exhaust note. Constructed with precision, this downpipe features a CNC machined turbine discharge flange and mandrel-bent T304 seamless stainless steel tubing that transitions from 3.5" to 3.0". The unit is 100% TIG welded for durability and includes a T304 stainless steel O2 bung and Torca Accuseal stainless steel clamps. The modular design simplifies catalytic converter installation and ensures smooth transitions for optimal exhaust gas flow. Fitment is specific to the 2017-current VW Tiguan 1.8T/2.0T 4-motion AWD (MQB) and the 2019-current Audi Q3 1.8T/2.0T 4-motion AWD (MQB). A note for vehicles with 184hp engines specifies the need for a 60mm reducer to connect to the factory exhaust; this should be selected from the dropdown menu. To ensure optimal performance and avoid a check engine light (CEL), Stage 2 software from a reputable tuning company is required. The manufacturer also recommends disabling the Soundaktor (noise amplifier) to fully experience the true exhaust note and prevent excessive drone. For environmental considerations, CTS Turbo promotes the use of a high-flow catalytic converter, and an optional CEL eliminator is available to further reduce the possibility of a cat efficiency code.