catless tune with cats

[GrabberBlue5.0]

Has anyone gone catless, had it tuned, and then put cats back on without a tune update?

I currently have LT's and an offroad x-pipe and wanted to put high flow cats on for sound attenuation (car is too damn loud). I do not have the handheld tuner used on the car (long story) and I do not want to spend another $400 simply to update the tune from "catless" to "catted". Is this a bad idea? will it foul out the O2's or the cats?

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[AlbertD]

I am certainly not an expert on "tuning", but I have heard of tunes being designed with cat protection... presumably adding some extra fuel in to keep them at a desired temperature. With that in mind, I can see the possibility of accelerating cat failure with an offroad tune, but... I will let someone more experienced in how tunes work on these cars to verify that. Personally, I would get an appropriate tune with the cats accounted for... they are too expensive IMO to take the risk of prematurely damaging them.

 

[GrabberBlue5.0]

I am certainly not an expert on "tuning", but I have heard of tunes being designed with cat protection... presumably adding some extra fuel in to keep them at a desired temperature. With that in mind, I can see the possibility of accelerating cat failure with an offroad tune, but... I will let someone more experienced in how tunes work on these cars to verify that. Personally, I would get an appropriate tune with the cats accounted for... they are too expensive IMO to take the risk of prematurely damaging them.

Yea, I generally agree with you. I have not yet installed the cats, and if I have to I will update the tune. The $400 for the new tune/tuner is less than a new set of cats anyways (I think I "stole" them at $370 for the pair, normally are a minimum of $430, specifically I am referring to Stainless Works cats).

 

[WildHorse]

Yeah, usually cat protection is turned off with a FFE tune. Put the stock/aftermarket back on without cat protection and your gonna have a very bad day.

 

[GrabberBlue5.0]

According to the linked thread, Shaun @AED says there should be no need for an updated tune when putting cats back on. But I was looking for verification especially since the post was from 2012. I did not know if anything had changed since then (which I assume it has)

https://svtperformance.com/threads/catless-tune-with-cats.900097/

 

[Andrew@Lethal]

Has anyone gone catless, had it tuned, and then put cats back on without a tune update?

I currently have LT's and an offroad x-pipe and wanted to put high flow cats on for sound attenuation (car is too damn loud). I do not have the handheld tuner used on the car (long story) and I do not want to spend another $400 simply to update the tune from "catless" to "catted". Is this a bad idea? will it foul out the O2's or the cats?

I highly recommend tuning your car back for cats. Another options would be to weld resonators in place of the cats to tone the exhaust note down.

 

[FruityJudy]

Vibrants calmed my car down significantly. I have heard the cj pony resonated x is even more significant in quieting down.

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