Bull-X downpipe 3.5″/89 mm for Audi TT 8J 1.8–2.0 TFSI with ECE

Bull-X produces downpipes to the highest standard. This Bull-X downpipe features an 89 mm upper section and is designed for all Audi TT 8J 1.8/2.0 TFSI models. Would you like to achieve more power from your turbocharged engine while also reducing the load on the turbocharger and surrounding components? The downpipe has a significant effect on response and power, as it forms the link between the turbocharger and the exhaust system. The larger the downpipe diameter and the greater the catalytic converter flow capacity, the more easily the turbocharger can discharge the processed exhaust gases through the exhaust system. This has a positive effect on torque and power. The increased flow produces a deeper, more purposeful sound. This downpipe is suitable for both standard and performance-tuned vehicles. Fitting can provide increased power, improved throttle response and lower exhaust gas temperatures.

Note: For vehicles with a manual gearbox, we recommend additionally selecting the optional torque mount. It is not suitable for vehicles with a DSG gearbox.

Key benefits

• increased power because the turbocharger can discharge the exhaust gases more easily
• more torque, as the turbocharger exhaust turbine reaches higher engine speeds more quickly and the sports catalytic converter can discharge a greater exhaust gas mass due to reduced back pressure
• reduced thermal load on the turbocharger and surrounding components thanks to the flow-optimised larger cross-section design
• no flow-restricting edges at the downpipe inlet thanks to the cast stainless steel flange
• pipe diameter: upper section 3.5″/89 mm and lower section 3″/76 mm
• available without a catalytic converter, with a 100-cell sports catalytic converter, with a 200-cell sports catalytic converter, with a Bull-X 200-cell EOBD sports catalytic converter by HJS or with a 200-cell HJS sports catalytic converter including ECE approval
• excellent compensation of engine movement through the fitted flex pipe with Interlock technology; the 150 mm long flex pipe prevents the braid from collapsing through its Interlock construction, provides additional stability and optimises exhaust gas flow
• manufactured from brushed stainless steel and TIG welded
• includes an adapter for the original exhaust system

After fitting the downpipe, the tolerance value of the post-catalytic-converter lambda sensor will generally need to be adjusted unless a version including approval has been selected.

Road use: Only the version with an HJS catalytic converter carrying EG/ECE approval is suitable for use on public roads, including the version for the Audi TT 8J 211 PS with engine code CESA. Versions without a catalytic converter and versions with 100- or 200-cell catalytic converters without ECE approval are intended solely for track use.

Catalytic converter information

When selecting a downpipe without a catalytic converter or with a 100- or 200-cell catalytic converter, the post-catalytic-converter lambda sensor may trigger a fault in the engine control unit. This does not affect driving, as the first lambda sensor is present for engine management, while the post-catalytic-converter sensor is only used to monitor catalytic converter performance. The fault can be removed by adapting the software through a specialist engine calibration provider.

Most vehicles up to Euro 3 emissions standard do not have a post-catalytic-converter lambda sensor, so fitting is possible without further adjustment or a fault message. HJS ECE and EOBD catalytic converters have a significantly higher washcoat content and very high oxygen storage capacity, which can prevent fault messages. The EOBD catalytic converters have been tested for this purpose up to Euro 4, while their durability and use are suitable up to Euro 6 emissions standard. On Euro 5/6 vehicles, the points mentioned above can only be avoided by selecting a catalytic converter with ECE approval.

Suitable for: Audi TT II (8J).

Manufacturer’s vehicle data

• Bull-X Downpipe 3″/ 3.5″ Oberteil Audi TT 8J 1.8-2.0 TFSI (mit ECE*)

Original product name by HG Motorsport (»z.B.« = e.g.). Please check model, year and engine of your vehicle before ordering; if in doubt, contact us and we will check for you.

Approval

Only the version marked “road legal” has a European ECE / EC approval (Bull-X Tronic controller with ECE or the HJS EC catalytic converter). Versions marked “no ECE, track use only” have no approval and are not permitted for road use. If in doubt about the version, contact us and we will check for you.