RAWE55

So I'm looking to delete my secondary cats, and run high flow primary cats. The fines down under are ridiculously expensive for having no cats, so that's not an option.

I want a quality set of either 200cell or 100cell high flow cats, what is everyone's experience/recommendations?

Metallic or ceramic?

More importantly will I need a retune if I run high flow primaries? O2 sensors? CELs?
I know deleting the secondary cats won't effect the o2s.

Will also be putting an x pipe in place of the resonator for sound purposes only.

BRH AMG

Global emissions systems Inc. Documented 700 RWHP. sold through Kooks in Statesville, North Carolina

Kelvin07

contact shardul, he has some very good high flow cats.

Hulk

Thunderbolt high flow cats

RAWE55

Thanks all. If I get 100cpsi cats will I throw a cel and need to re flash it out?

mr747

How did u get your mbh headers to fit a rhd car??

RAWE55

It's a real tight fit with the steering column, I had a buddy buy them for his car with the intention of modifying them to fit, he later changed his mind on modding the car altogether. I warn you that you will most likely void the warranty if you do but we ended up cutting them and re welding, the flow isn't as ideal as the original design but it sure beats the log style manifolds. It took us a few days fitting and re fitting, cutting, mandrel bending and tack welding to test fit until we were satisfied. It can be done but it's a real PITA. Any competent exhaust shop can have it done for you, fortunately enough we have a professional tig welder working out of our workshop. If I had my time again I would get some Di Filippo or supersprint long tubes like I originally had in mind. A lot cheaper and great flow characteristics. I think Sonny Duran installs something similar at his shop in Sydney. Autowerx Automotive. But I got these for a bargain, although they needed a lot of work to make fit, I'm still happy with the outcome.

mr747

Cool thanks for letting me know

Worth the wait

Random technologies have never failed for me.

Exotic-metal55

Sounds like your conditions warrant you to go with Random technology cats. They are expensive but if fines are high and you need high qulity flow with effecient cats, then I also suggest random tech.

RAWE55

Quick update guys, my exhaust guy and i spent 6 hours on the car today. We modified the stock downpipes to take 3inch 100cell cats with 5inch housings, best highflow cats in australia, and buttoned them up as if it was like that from the factory. The front section took us 2-3 hours of playing around.
The 02 sensors were not touched. Still waiting for the CEL but looks like these 100cell cats are doig their job as no CEL yet. And the highflows sit between the sensors.

Managed to sneak in the wideband also. Attached photo of highflows with factory downpipe.

We deleted the secondaries and got an x pipe in place of the resonator. We decided it would be a good idea to leave the balance tube or h pipe in pre secondary cats. The tone is insane under load. Idles like stock. Just what you want! If i get bored ill get c63 mufflers.

RAWE55

We had to add a little offcut to bank 1 as we cut too much off, it can be done though. Just very time consuming

cij911

+1...Have these on a highly modified Evo and the RT work very well.