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Engineered as the ultimate downpipe solution for your Audi B9 S4 or S5, every detail is maximized to provide the turbo and engine with a completely unrestricted exhaust flow path for up to 45HP & 41TQ (on hybrid turbo setup). The TIG-welded 304 stainless and investment cast body delivers addictive sound, quality finish, effortless install, reliability, and maximized performance for your turbocharged V6.
HIGH-QUALITY
CAST BODY
DOWNPIPE
PERFORMANCE
200 CPSI
CATALYTIC CONVERTER
MAXIMIZED FOR
HYBRID & STOCK
TURBOCHARGERS
LEADING FEATURES
- 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.
INVESTMENT CASTING
Other aftermarket downpipes use large sections of thin-wall steel tubing to manufacture the downpipe body; this is a cheaper process but can reduce sound quality and sacrifice exhaust flow. Investment casting allows for an optimized design that smoothly transitions exhaust flow from the massive 6" body to the dual 2.5" exhaust legs. The casting also provides a beautiful look that turns the entire downpipe into an attractive gold finish as it wears in from heat cycles over time.
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.
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!
GAINS CHART
The following chart details the power gains (WHP & WTQ) over the baseline power numbers taken from the stock downpipe on our hybrid turbo development S4. The "0" baseline is the maximum power/torque made, and each following increment is the additional power gained from the IE downpipe upgrade.
The above power gains are a result of various design details:
The 6" 200 CPSI racing CAT improves exhaust flow.
The increased size of the downpipe body and smooth transition into the midpipes quickly evacuates exhaust gases away from the turbine wheel, improving turbocharger speed and efficiency.
The thick-wall investment cast body reduces radiant heat keeping the engine bay and charge air cooler.
To learn more about each of these features, click the design tab above.