UnknownJinX

0166 is probably fine then. HJS cats are generally pretty durable with their triple winding design versus the single winding you see with most cheapie cats.

Also, I got my advice from Steve Dallas and he tracks his RX-8 with the same cat, so durability is definitely not an issue.

I have 2 concerns, though:

- What is your local emission law? Does it have to be OEM or is an aftermarket one like HJS fine? I think I have read that RX-8 met Euro 4 with OEM cat, but since rotaries aren't exactly great at burning up all the fuel(hence the flames without a cat), 0182(which is rated Euro 5 I think) could be a safer choice.

- When HJS said they don't know the size, they meant that all they sell is just the catalytic converter itself. It doesn't come with a mid-pipe. So will you be using the OEM mid-pipe and have a welder rig something up, or will you get an aftermarket mid-pipe(BHR is highly recommended but can be pricey to get if you are outside of North America)? Remember that rotary has a fairly high exhaust temperature, which is enough to melt fiber glass and steel wool based resonators.

UnknownJinX

Some pics for reference:

HJS only sells the martini shaker. This is my combo as stated in my signature.

ArthurH

I will ask about the emission law regarding this.
0166 is also EURO 5. I'm not sure what the actual difference is between those two cats, apart from a difference is size (0166 is 76mm, 0182 is 70,5mm). And yes, I'm hoping to weld the martini shaker onto the OEM mid-pipe. The lads at the garage said they'd do it no problem, but without a guarantee..(they only give a guarantee if they work with OEM parts, that's normal I suppose..)
I'm also about to order BHR coils and wires from essexrotary, cause I have no idea when or if the coils were ever changed.
No one is getting any Christmas presents from me this year, unless I make them with my own hands LOL (I suppose I could make an artsy composition from an old CAT and a set of burnt coils.. for mum?)

Sydo

Steve Dallas

I have been running the HJS 9095 0182 welded into a BHR midpipe for over 10K miles, with about half of those being track miles, without any sign of failure. That includes one weekend during which the car was driven all day every day for 4 days by club racers. No other aftermarket cat would survive my use case. Just FYI.

ArthurH

Shouldn't be a problem to weld either of those cats onto that, right?
I mean as long as the pipe isn't bigger than the cat it must be fine.

ArthurH

So they had a look at my babe's belly and said there's no way the can weld the universal CAT onto the OEM midpipe, as our cat has a funny kind of shape (it's not straight..). So now my options are:
either to order a universal CAT + midpipe = about 1000 euro
or OEM cat = 1300 euro.
Not good, either way.
They suggested I change AFR and o2 sensors and see what happens. Since my CEL just went magically off it could mean it's just a sensor malfunction, which causes me to run rich, they said (as I'm 3 times over the CO2 limit).
Thoughts?

UnknownJinX

So you haven't actually looked at the OEM cat yet?

Have someone take it off and take a peek inside to see if the element is still there and not clogged.

Sydo

Sydo

UnknownJinX

BHR mid-pipe on its own is awesome, but the cat they use by default isn't all that durable. I ordered and directly shipped the HJS cat to BHR and they welded it on for me.

Read their description:

As a general rule of thumb: if the cat+mid-pipe combo isn't cheaper than the factory one, it likely won't hold up. There might be exceptions, but you are on your own to figure it out.

Again, pull the cat itself off to see if there is any damage inside. A cheaper alternative could be going to a junkyard/wrecker and see if they have used OEM ones lying around.