performance exhaust and race cats help ???????

We're huge fans of Novitec here at TAG and if you're looking for an F1 type sound this is the way to go. Most OBD cat simulators work just fine. Capristo is another solid choice and they both sound great!

Here is a video of a 458 with cat delete pipes and the rear box.
Let us know if you have any other questions!

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The CEL light can be cleared but it comes back on. I de-catted my 991tts and the CEL light would clear itself but the O2 sensors would still read not-ready irrespective of the light being on. That is what matters here in Texas for the emissions tests. I think for inspection you just have to put the regular cats back on. I never saw anyone with the 100 cell cats not have problems with CEL. The 200 cell cats for the most part don't have any issues. I had them for two and a half years before I de-catted.

 

This was on my 991tts, not 458 but I believe the behavior will be similar as other people experienced the same thing on other cars, specifically BMW M series. The obd tools only clear the code but the O2 sensors will still read not ready when the inspector tests the car. As far as I know, the tools that clear the codes are not legal to sell either but garages have them so I am not sure about the exact legalities.

I had 200 cell cats on my BMW M5 and the 991tts, neither car ever failed inspection or posted a CEL based on the cats or exhaust. It wasn't until I de-catted the Porsche that I started getting CELs. They would clear after a while but I had an OBD reader and I could see that even though the car didn't show CEL, the O2 sensors showed not ready. That is what the emission inspection tools look for.

I should also add that stock cats are 600 cell and so going to 200 increases flow almost as much as 100 cell does but without any risk of CEL.

 

I have a similar setup on my 458 and I love the sound. I have headers, the 100 cell cats and the software. I have been running this setup for over 2 years. I am using the factory muffler and it sounds and performs fantastic. The car is making a good 50hp over stock. In this setup the NR software controls when the flaps open in the muffler so in sport mode the flaps stay closed when I'm not really pressing on- which is nice for driving through neighborhoods. Its a little louder than stock but not super loud. However, Race mode means the exhaust flaps are open all the time and the sound is very loud and as I noted it is fantastic. I like this setup as it was suggested to me to give it a try before their muffler. I think the sound is an octave lower than what you would have with the muffler. I also think their muffler still has flaps so I'm not sure you would need the Forza controller. By the way, I have never had any check engine lights/ warnings with this setup.

 

I have a system to open and close the valves manually like Akra, Capristo and Forza (built here locally for less than 1/2 price) …

What I find is that travelling longer trips, I really get tyred from all that noise and I close them again often.

Also the wife doesn't like the open valves …. and neither do the nextdoor neighbours … as mentionned by Caeruleus11

So … think of that too ….

 

Yes I have the NR software, I think they said it does not void the warranty, but maybe it does.

 

The only for sure way to remove the CEL is do have it removed via ecu tune. Its what ive done for my car and havent had any issues. i have also turned off the secondary air/cold start pumps as they were malfunctioning and causing codes to pop up. I also run ethanol(e85) on my 458.

 

My comment above was supposed to say maybe you should find out if it does.

 

I am very very happy with the changes to the car. The power difference is noticeable and the car sounds just the way I always wanted it. Its not quite that high pitched scream of the 355, because the 458 is a larger engine (and lacks the 5 valves per cylinder) but makes a kind of higher end baritone wail.

 

Ozan,

As others have mentioned, the best way to take care of the CEL would be through Novitecs ECU Remap. This does have about 10 day turn around as the cars ECUs will have to be shipped to Germany. Not only is the CEL taken care of but the red line is raise to 9,100 RPM and you have valve actuation control from the Manettino.