Hi all,

Been researching around the forum, looking for a solution to my rattling cats. I've decided on HFCs but have no preference for brand or budget really as long as it's less than what OEMs cost! Around here I have seen:

• Z1
• Fast Intentions
• Invidia
• Kinetix
• Berk
• ARK
• AAM

I am in PA and aiming to pass emissions next year regardless of choice. Any added power would be cool but not the main goal. I have an Invidia Q300 right now on my sedan so looking to keep things relatively quiet if possible. Seems like resonated is the way to go. Which of these will be the quietest and pass emissions? Leaning towards FI or Z1? If they end up throwing a code, I plan on taking it to RT Tuning to get an ECUTek tune which will hopefully make the most of them and get rid of the code. Is that a solid plan?

 

Resonated FI would be the quietest. I think that's the direction I'm going to go. I have the Berks with a Ark Grip and it is pretty loud. Almost too loud for me sometimes.

I wanted the Motordyne art pipes but they don't fit the awd without modification and they are supposed to be louder than the Berks.

 

Thank you for the feedback! Looked up a lot of YouTube clips but hard to get a comparison.

 

Any high-flow cats you get are gonna sound the same IMO unless they’re resonated, I went with Kinetix for mine because of their warranty (lifetime) and good reviews….they are quite a bit louder than my stock ones though, so I may add some resonators later on.

 

I’ll be having my AAM resonated high flow cats installed within the next few weeks and will post a video once they are on. I’ll be running them with my HKS hi-power catback on my coupe, for now. But they are good looking past some back purging that was missed. Nothing I can’t live with though. They use Gesi 10025 cats which should hold up to higher Hp levels for supercharged applications or a built motor. One thing to note though is that the Gesi 10025 are not their EPA approved cats, according to the Gesi website. So for more strict states, the AAM resonated HFCs might not pass. But I’m guessing (er hoping) they still will pass smog…Gesi makes the best of the best.

 

Can anyone provide their experience with emissions testing when using High Flow Cats?

 

Has anyone got a CEL with the FI HFC's on a 2012+ ?

 

Mine passed and has passed every year since installing
I never had a CEL and it has never shown up since installing

 

11 years and 40k miles later, never had a CEL because of the FI exhaust. I've got their RHFC and Cat-back on a 2011 6MT.