High Flow Catted DP

[jayyp]

Originally Posted by mike@x-ph.com

Hi,
AR are redesigning their website, best would be to check vendor websites for AR design photos.
they use Magnaflow 200CEL cats.

I will get you catted pictures by the end of the week, here are the resonated pictures (looks very similar to how catted will look)

So AR is back in business again? I have been running a set of AR catted downpipes for some time now, but the fitment of it is slightly off. I brought it to AutoTalent twice to try to get it adjusted, but no go. We had to basically add washers to the plate that mounts up underneath in order to avoid any vibrations.

[mike@x-ph.com]

Originally Posted by jayyp

So AR is back in business again? I have been running a set of AR catted downpipes for some time now, but the fitment of it is slightly off. I brought it to AutoTalent twice to try to get it adjusted, but no go. We had to basically add washers to the plate that mounts up underneath in order to avoid any vibrations.

Thats unusual from an AR product ... We have never had a single fitment issue with them yet

[THX]

Originally Posted by hemi to e90

i have to say you have the best combination of exhaust parts on youtube

and the most under-appreciated.

Thank you bro

[Lojs]

Would be great to see some dynos vs OEM cats, otherwise totally pointless

[STR8-6IX]

the stock downpipe is already high flow, dont waste your money unless you're going catless

[mike@x-ph.com]

Originally Posted by Lojs

Would be great to see some dynos vs OEM cats,

I like this idea

[AlexNFH]

Is a vendor willing to partially sponsor or discount some HFC downpipes then? ;-)

[mike@x-ph.com]

Originally Posted by AlexNFH

Is a vendor willing to partially sponsor or discount some HFC downpipes then? ;-)

I am

[tom @ eas]

Originally Posted by AlexNFH

Is a vendor willing to partially sponsor or discount some HFC downpipes then? ;-)

Cheapest doesn't mean best in all cases.

Mangaflow cats aren't known for quality, they're just cheap. They can be had for ~$80ea on eBay - so lots of people opt for the cheaper price. GESI cats run for about $600 each, but they flow well and last for a very long time.

Expect to be replacing the Magnaflow cats within 2-3 years, BMWs eat these things up. Save up, and get the right part the first time, so it doesn't end up costing you more in the long run.

[Jeff@TopGearSolutions]

I'd have to agree you get what you pay for. Cheap cats are cheap for a reason.

If I personally went with a high flow catted opitin I'd want a higher quality cat otherwise don't bother.

[hellokitty]

Will you get a CEL with HFCs?

[drgmt]

Stock cats are not high flow.

They are designed for emissions restrictions and not performance.

Usually 400 cell and up given the free flowing nature of piping proximal to it.

[SanchoDivine]

Originally Posted by THX

It is my M4, i' m from Italy.
With ESS HFC definitly hear turbo spool and no bad smell.
With stock DP no hear turbo spool.
The problem is that ESS HFC cost 2300,00 euros.....

With just a mid pipe I had a significant amount of turbo spool sound.

[THX]

Originally Posted by hellokitty

Will you get a CEL with HFCs?

Yes.

[mike@x-ph.com]

Originally Posted by hellokitty

Will you get a CEL with HFCs?

Depends on the cats used

[aBMWfan]

Originally Posted by hellokitty

Will you get a CEL with HFCs?

Yep. No obvious catless smell though

[hellokitty]

Originally Posted by mike@x-ph.com

Depends on the cats used

What brand cats wont give a CEL? AR, ER, etc.?

[mike@x-ph.com]

Originally Posted by hellokitty

What brand cats wont give a CEL? AR, ER, etc.?

Im not aware of any brand that gives you 100% guarantee of no CEL but you want to get an Euro cat or similar.

A generic cat will probably result in a CEL
Keep in mind the higher the cat quality is the more expensive the downpipe will be.

[tom @ eas]

Originally Posted by hellokitty

What brand cats wont give a CEL? AR, ER, etc.?

You'll need a tune to take care of the CEL if installing a catless or HFC catted downpipe.

[aBMWfan]

Originally Posted by hellokitty

What brand cats wont give a CEL? AR, ER, etc.?

None of them prevent CEL. Assume that's the case, till someone proves otherwise

[mike@x-ph.com]

Originally Posted by Bem4

None of them prevent CEL. Assume that's the case, till someone proves otherwise

Agree

[AW M4]

Gesi / hjc are much like a factory spec cat. It has similar flow properties and that’s why they don’t throw check engine lights (cel). They will also have a similar lifespan of stock cats for that reason as well.

200 cell metallic race cats will typically make power as they flow better vs gesi/hjc. Drawback is that because they flows more, the o2 sensors will also read more. This is why the cel will come up. Metallic cats are little bit more durable and tend to deal better with high heat applications.

They won’t have longevity like a factory or gesi/hex cats, but they’re race cats and are not meant for longevity. Stock or gesi/hjc will get maybe 100,000 miles and you should expect to get about half of that on 200 cell race metallic cats.

Honest truth is that they are unlikely to fail. We will all probably be in another car before that even comes up. All the options are solid choices, just weigh out the pros and cons to make the decision for yourself!