Which set of Downpipes?

FLHRXS · Apr 15, 2023

Has anyone done a comparison between the various downpipes on the market?
I am looking at the CVFab and Whoosh versions. The SPD downpipes look nice but not nearly nice enough at nearly double the price of the others. I’m sure there are others to consider as well.

So what are everyones’s recommendations and experiences with the pipes they have chosen?

FLHRXS · Apr 15, 2023

I guess (at least for me) it doesn’t matter anymore since I just pulled the plug. I couldn’t resist the current discounted price on the CV Fab downpipes at $540 shipped to my front door.

That said, I’m still interested understanding whether there are any differences.

V3nom3nom · Apr 15, 2023

Only big difference between whoosh and cvf is the heat shields.

viking · Apr 15, 2023

you forgot to throw in FenFab to your list

UNBROKEN · Apr 15, 2023

You’re paying less because reportedly they use 200 cell cats that require defoulers. SPD and FenFab use 400 cell epa legal cats…which cost more.

SR56 · Apr 15, 2023

UNBROKEN said:

The Whoosh claim to be 400 cell as well.

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FLHRXS · Apr 15, 2023

As does CVFab

UNBROKEN · Apr 15, 2023

FLHRXS said:

Maybe now…but they didn’t start with them. I know where some of their pre-production parts are and they’re not 400.
Here’s a hint…if you need defoulers it’s a cheap cat.

FLHRXS · Apr 15, 2023

I don’t know what those are but it doesn’t say anything about them here: https://www.cvfab.com/products/st-dp. Just says 400 CELL. How do you tell if the cats aren’t good?

Blown F-150 · Apr 16, 2023

It seems that everyone is using a 400 cell count car now. Seems to be relatively recent and likely being done to keep the EPA “monkey” off their backs.

SPD and P&L offer GESI cats (option on the SPD) which are very good, but expensive for sure. I’m not seeing a major difference in materials used between the options.

Personally I really like Brett’s craftsmanship, so the plan is to go that route and order hot-side pipes at the same time.

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UNBROKEN · Apr 16, 2023

There are different levels of converters….from cheap to GESI. SPD offers GESI as an option now and someone else did as well a while back…I doubt there’s many people wanting to pay for those. A high quality 400 cell cat will not need a defouler. A low quality cat usually will….a 2-300 cell cat definitely will.

ARC · Apr 16, 2023

I haven't installed my CV DP's yet. Will I have a problem in anyone's experience?
I am not familiar with these "defoulers" can someone explain?
Thanks

FLHRXS · Apr 16, 2023

UNBROKEN said:

Dang it. So besides the $2500 SPD option, which downpipes have cats without them?

I confirmed with CVFab that they do have them. Below is their response:

“[T]here are two defoulers in the box for the two lower o2 sensor holes on the cats themselves. It’s standard for any aftermarket high-flow downpipes from any brand.”

ARC · Apr 16, 2023

FLHRXS said:

Now I got to go look in the box again to see if I have them.
Plus my installer insists that my tune needs to be reworked after the install.

Blown F-150 · Apr 16, 2023

FLHRXS said:

The regular SPD’s should not require defoulers. Same with Fen Fab. I’m not sure about Woosh.

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CCPluvr · Apr 17, 2023

Regarding downpipes is there any value to the stock parts once you replace them?

CVF-Jason · Apr 17, 2023

UNBROKEN said:

To be clear, we use 400 cell cats. We do not use 200 cells. Some of the other guys claim no CEL on 400 cell cats but have had them pop historically (at which point they provide defoulers to customers who reach out to them) - on other platforms as well. Others also include defoulers in the box - that's not exclusive to us.

We state 400 cells on the product list as that is what is, and has always been, on the product. We include defoulers as a "fail safe" more than anything. Historically the last thing a person wants to do in the rare case of a CEL popping is go back under and install defoulers afterwards (from our experience).

CVF-Jason · Apr 17, 2023

UNBROKEN said:

Addressed this in the comment above, but since it's referencing us I feel we should reply and say this is also not correct.

UNBROKEN · Apr 17, 2023

CVF-Jason said:

Was told that by the person who has them on their car. Popped a CEL immediately and you sent defoulers.

FLHRXS · Apr 17, 2023

I have reached out to a few manufacturers to see which ones use defoulers. Will report back if they respond.

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