355 F355 5.2 and tubi test pipe ( cat replacement )

I think the factory’s have ceramic cores and have the potential to crack/block/overheat. My understanding was the all metal options from a couple vendors out there are the safest/highest longevity option.

 

Not a 355, but for my Scud, I switched from 100 cell HJS cats to straight pipes and the sound changed marginally. Perhaps a 15% bump in volume, that’s about it. Straight pipe still sounds cleaner, but not by my much.

I mention this because most Race cats for the 355 are 200 cell. Perhaps a happy medium is 100 cell cats and maybe HJS brand, since they are known to flow well.

Fabspeed or Kline can build 100 cell HJS cats for the 355.

100 cell will still give CEL issues unless you get really creative. 200 cell might not give CEL.

 

my experience is a little imperfect because I was randomly getting a 1448 before I switched to catless y, but it should not generate a code bc high rpm exhaust gas should generate enough heat to easily trigger the probe.

 

my 200 cell hyperflow threw a code, 02 extenders+ steel wool solved it though.

 

https://www.modusperformance.com/products/o2-oxygen-sensor-extender-spacer-extension-m18x1-5-hho-bung-1-75-usa-02-cel-fix?variant=39293698769078&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gclid=EAIaIQobChMIqJrompSg9QIVyMqUCR202Qr4EAQYEyABEgKyFfD_BwE

Something like this, a straight spacer with pretty rough grade steel wool like single 0. These worked with a high flow cat that was causing cel.

I tried 90 deg fabspeed mini cats w my test pipes- but they did not work consistently.


https://www.fabspeed.com/universal-o2-spacer-with-catalytic-converter-single/

My next move was to replace the 02 sensors because the wires were pulling at the plug but I learned to live w the cel and just check it every few hundred miles.

 

You scrub the outside of the extender until they are shiny. Everyone knows that a shiny car works better.

OK, just kidding. You stuff the inside of the extender with a small amount of steel wool so that the overall air volume of the thing is smaller.

 

I like to see you make steel wool burn up .....

 

The type you provided a link to comes with a small piece of cat material. It does the job of the steel wool.

A lot of folks recommend Big Daddies Garage. They are the steel wool type and contain (quality) steel wool already:

http://www.bigdaddiesgarage.com/angled-cel-fix.html

For use at the post-cat position only.

 

Ah, Ben... are you in New Zealand (Wellington)? It may be simpler/faster to go with the NZ product.