New Cat Converter?

there is a thread for a GT4 with magnaflows not sure if they are the same

 

https://www.ferrarichat.com/forum/threads/new-cars-ready-for-install-308-gt4.577350/#post-146019553

 

What year/model do you have? I am not aware of a substitute for the slowdown chip, but its just a fancy device to read a thermocouple and send warnings via a blinking or fully on light. You could install a generic one with a temp guage in the cabin and achieve the same purpose, being an indication of the cat overheating due to unburnt fuel igniting in the cat. I recall a link in a thread that had a supplier for thermocouples for industry.

 

Yes I just finished mine. I used the magna flow because they offer an offset spun cat that correctly fits like he oem. I purchased them from summit racing along with 2 inch stainless steel pipe and the flanges from Mandrel bends.
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I first started with these but the fit wasn’t correct because there is no offset.
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Did you throw the Hyperflow away?

Not as pretty as a Hyperflow (and not as loud and with more correct flanges), but I was happy with the cats I bought for my TR from these guys (TR uses the same cat as a 308QV/328):

http://www.deccats.com

which were effectively 5.0 Mustang cats with the correct flanges for the TR (in fact, they were truly correct flanges; whereas, the Hyperflow flanges aren't really quite right). I've got Hyperflows on my TR now, but will probably swap back to to the DEC just to be a little more stealthy

 

I have to say that deccats website is absolutely terrible to navigate and find information. Then once you find the cat, you have no idea how to order it or how much it costs. Skill gaps, yup.

 

And their catalog for Ferrari is sort of messed up -- the same F cat, 121385, is used on many US models (TR, 308QV, 328, MondialQV, Mondial 3.2) = their FE4304 (or FE84304 for CA), but they have no listing for the QVs and for 328 they show FE4303 (which must either be a typo or they are making two identical things with different part numbers ). I can personally report that FE4304 replaces 121385 well (although 121385 is a superior design, but just too expensive!).

 

I have been looking at cats recently also, has anyone tried these? They look pretty similar to stock, was told they still may not pass CA smog though (because they don’t look enough like one?) anybody have experience with them?

https://www.ebay.com/itm/Catalytic-Converter-DEC-Converters-FE4302-fits-80-83-Ferrari-Mondial-8-3-0L-V8-/401221110773

 

On the GT4 you need the offset cat so that you have enough clearance from framing. Also I was surprised at how loud these cats are.
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