IE Performance Downpipe For Audi B9 S4 & S5 3.0T

• Required to support hybrid turbo ECU calibrations
• High-flow design to support full-bolt on stage 2 power capabilities
• Removes any downpipe restrictions for full available power
• Increases exhaust sound with improved engine & turbo notes
• Improves turbocharger efficiency & speeds up turbo spool
• Thick-wall casting reduces radiant heat in the engine bay
• 200 CPSI performance high-flow catalytic converter
• 304 investment cast downpipe body
• 304 stainless steel downpipe legs & CAT
• Massive 6" downpipe body to dual 2.5" downpipe legs
• Hand TIG-welded for superior reliability and surface finish
• Direct bolt-in factory replacement
• CNC machined v-band and bolt flanges for leak-free operation
• Installs to the stock exhaust or IE Midpipes upgrade

*Requires Stage 2 or hybrid turbo ECU tuning

MOTORSPORT SOUND
IE's unique thick-wall investment castings produce an aggressive, drone-free exhaust note without the "tinny" sound typical on most full stainless body aftermarket options. Enjoy not only a louder exhaust but one with improved engine and turbo notes that will deliver miles of smiles.

PERFECT FIT
The B9 3.0T hot-v style engine has a unique center-mounted turbo with a large downpipe that quickly splits into twin-sided exhaust sections. This challenging configuration requires exacting alignment to avoid install hassles, rattling, rubbing, and exhaust leaks. IE engineers utilize advanced 3D scanning technology and rapid prototyping to guarantee a flow-maximized design that exceeds even the factory fitment.

200 CPSI CATALYTIC CONVERTER
IE's downpipe includes a high-flow 200 CPSI catalytic converter. This performance CAT allows for full and unrestricted power from Stage 2 ECU tunes and hybrid turbo upgrades while reducing emissions output and eliminating unwanted smells and bumper stains found on cat-less designs.

Catalytic converter warranty is only available for cusotmers running IE performance ECU software.

HYBRID TURBO READY
The stock downpipe becomes a significant restriction when upgrading to a larger hybrid turbo. IE's cast downpipe is a direct-fit to available upgraded turbochargers on the market and will allow total horsepower, torque, and spool potential from your turbocharger investment.

IE's B9 S4 & S5 intake system, turbo inlet pipe, and downpipe are hybrid optimized, making the installation of popular turbo upgrades an easy bolt-in process.

DYNO TESTING
Real-world power numbers are achieved using our in-house dyno cells to verify the efficiency of the downpipe design. Dyno testing performed in controlled conditions on a hybrid turbo equipped B9 S4 resulted in consistent and significant power gains of 45HP & 41FT-LBS to the wheels!