I’ve been meaning to ask about the cats that come with this exhaust. How many cells and who makes them? Is the matrix steel or ceramic? Has anyone ran this exhaust with 200 cell steel matrix HJS cats?
Front section comes with a test pipe no catalytic converter.
Those that need a 50 state catalytic converter can purchase one
Specs
TWHC catalytic converter
400-600CPI depending on current smog legal requirements.
Ceramic honeycomb
There are not steel core cats they are called Metallic Substrate.
Brand is irrelevant because it's based on metal content and who has the correct EO approved number for the current year based on the application. So if you really want to know the brand the cores (not finished product) are sourced form APC, Continental, Tenneco, Car Sound etc. Every time I order catalysts its always based on approved EO # and flow specifications for the application.
If you wish to run HJC cats you would have to provide the cats and they will be made to fit. I have done a set for a customer who was adamant about running a HJC cat he is located in Canada.
HJC makes fantastic performance catalytic converters but they are not smog legal in all 50 states, here in the USA they are classified as a performance catalytic converter "Race use only". They are great for track events that require catalytic converters and sound control.
If you are looking for max power ditch the cat, if it's for smog then get a legal cat. Running an HJC 200CPI cat is cool and all but at a $500-800 price tag for each catalytic converter whats the point? HJS cats work best when they are close to the manifold or right next to a turbocharger, having them under the car causes issues with heat expansion. Cats like to hit a temp and stay there, they are not happy if it heats then cools thats causes the biscuit (core) to shrink and you end up with a rattle noise. The common cats like Magnaflow are designed for stop and go traffic, Hot/Cold situations. The ceramic style catalytic converters do not shrink and tend to last longer.
HJS cats LOVE heat they are more efficient when they are extremely hot.
HJS part number needed for the 500E 90950072, 2 units will be required current price is about 640Euro before shipping.
let me know if you have any other questions...