HJS Sport Cats with certification mark

HJS Catalytic Converter with E-mark: Legal high-flow sport catalysts at Turbo-parts.de

A high-quality HJS catalytic converter meets the highest standards for exhaust flow, thermal durability, and mechanical workmanship in the performance sector. The universal metal catalysts and vehicle-specific downpipes with integrated HJS sport catalysts are the ideal tuning solution for performance-enhanced vehicles: They significantly reduce exhaust backpressure, boost performance, and ensure full legality for everyday use.

Thanks to the ECE number (E-mark) stamped on the housing, the HJS catalytic converter is officially approved for road use. This enables hassle-free registration in the vehicle documents—for maximum performance off the racetrack, without any legal risks in everyday use.

ECE approval mark: Your ticket to legal road use

The biggest problem with conventional tuning catalysts is their legality for use on public roads. An HJS tuning catalyst with ECE approval permanently resolves this issue:

• Registration made easy: Thanks to the existing ECE homologation number, the inspector has an official document valid throughout Europe during the inspection (e.g., as part of a modification inspection under § 19.3 StVZO or an individual inspection). This greatly simplifies the process of obtaining the registration in the vehicle documents.

• Off the racetrack: Many motorsport catalysts are designed exclusively for the racetrack ("Not for Highway Use"). With the HJS ECE catalytic converters we offer, you can drive your vehicle completely legally on public roads, pass any police check, and successfully complete the regular vehicle inspection and emissions test (AU).

• Don’t risk having your vehicle impounded: Driving without an approved catalytic converter results in the revocation of your vehicle registration and may lead to charges of tax evasion (due to altered exhaust emissions). A certified HJS sports catalytic converter protects you from these consequences.

Technical Specifications: Single-flow vs. dual-flow catalytic converter setups

Depending on the engine type, displacement, and desired performance goal, the optimal configuration of the exhaust system varies significantly in order to both minimize back pressure and ensure emissions compliance for the TÜV:

4-cylinder engines (e.g., 1.8T, 2.0 TFSI / TSI)

For classic 4-cylinder turbo conversions like the popular VAG 1.8T, a single, large-dimensioned HJS metal catalytic converter (e.g., in a 76mm / 3-inch downpipe) is usually sufficient. A single 200-CPI catalyst offers the perfect balance here: optimal exhaust flow for power outputs well over 300 hp and sufficient filtering capacity to easily meet the emissions standards required for TÜV registration.

High-displacement projects with 5 or more cylinders (e.g., VR6 Turbo, R32 Turbo)

In extreme performance projects with more than 4 cylinders and large displacement, a single catalytic converter quickly reaches its thermal and flow-related limits due to the enormous exhaust gas volume. For engines such as the VR6 Turbo or the R32 Turbo, it is strongly recommended to opt for a dual-flow catalytic converter setup (bi-cat system).

By installing two HJS catalytic converters connected in parallel:

• The effective cross-sectional area is doubled and exhaust backpressure is significantly reduced.

• The thermal load per catalytic converter is halved, which protects the service life of the precious metal coating.

• Ensures that the enormous exhaust volume at full throttle is optimally cleaned to reliably meet the legal limits during the emissions test.

Highest standards for flow rate and durability

Unlike restrictive OEM catalysts with ceramic monoliths, an HJS performance catalyst utilizes a highly stable metal carrier structure. To ensure compliance with the strict ECE guidelines for road use, highly advanced 200-CPI or 300-CPI HD matrices are typically used. These offer a drastic reduction in exhaust backpressure with perfect fit.

Every HJS catalytic converter in our range can withstand consistently high exhaust temperatures of over $950^\circ\text{C}$, as they occur particularly in turbocharged engines under full load.

Emissions standards and exhaust classification

With appropriate engine tuning and sizing, an HJS metal catalytic converter easily meets the required limits of the EURO 3 standard as well as higher emission classes*. The precise precious metal coating (platinum, palladium, and rhodium) ensures that the exhaust gas conversion remains fully functional.

*Important note regarding emissions classification: > Exact compliance with a specific emissions standard depends on the vehicle’s overall system, engine displacement, engine management, and individual software tuning. For legal registration under the StVZO, consultation with an expert or inspector is advisable.

Tuning expertise and service at Turbo-parts.de

Universal and custom solutions

Every tuning project places its own demands on the exhaust system. In addition to universal HJS converters in standard pipe diameters, we also carry vehicle-specific upgrade downpipes with ECE approval. If you need assistance selecting the right catalytic converter for your street-legal setup, the team at Turbo-parts.de is here to help with their technical expertise.

Fast shipping directly from the warehouse

We know that workshop and modification schedules are tight. That’s why when you order your new HJS sport cat on Turbo-parts.de, you’ll benefit from high stock availability, fast shipping, and hassle-free processing.

Legally optimize your exhaust system for the road: Order your HJS catalytic converter online now at Turbo-parts.de!