350z HR Z33 370z Z34 TORQEN High Flow Cats HFC v4 - 300cells

The cats are specially manufactured for TORQEN. The interior substrate is made from an ultra-thin metal foil. The foil itself is a made up of a combination of iron, chromium and aluminium. The substrate is more resilient than ceramic core substrates and so is ideal for high performance use. 300 cell cats cater for the latest version of OBD2 Standard, so in theory these should pass MOT providing they've been properly heated before the test.

The catalyst is comprised of corrugated stainless steel foil, interlaid with stainless foil sheets to prevent nesting. As the ceramic, the coating process if very strictly controlled to ensure that the precious metals within the wash coat are evenly distributed throughout the catalyst. This is to accomplish two very important objectives: provide maximum emission reduction and prevent any excess wash coat build-up that might clog the cells and reduce flow performance.

The metallic catalyst does not require a mat to cushion it within the stainless steel shell, as it is not brittle like ceramic. The outer layer of the metallic catalyst is actually slightly crushed when the catalytic converter is assembled, locking the metallic catalyst securely within the catalytic converter housing.

These will come with bolts, nuts and gaskets, ready to fit.

PLEASE NOTE:

Any High Flow Cats, including ours, aren’t guaranteed to pass MOT emissions tests in UK. They’re designed to improve exhaust flow and engine performance, not emissions. That said, 99% of them do pass as long as they’re properly warmed up before the test. Most customers go for a hard drive—low gears, high revs—for 20–30 minutes beforehand. The hotter the cats get, the more efficiently they work.

The EML (engine management light) comes on because the Nissan ECU detects more oxygen in the exhaust. The only way to prevent that is with a remap using EcuTek. A remap is also recommended because the engine will run lean after fitting high flow cats—especially if you’ve also fitted intakes. Remapping helps balance the fuelling, improves power and can reduce fuel consumption.

The original Nissan cats are 600 cells per inch and contain far more precious metals, which is why they cost around £1,900 per side.