I've got a 2012 Lariat with the 5.0. Right now I have a Flowmaster 44 series and was thinking of deleting the cat. Has anyone else done this? If so, what has your experience been(power, sound, MPG, etc.)? Pro's and Con's? Thanks!

 

That's a federal crime ($2,500) and illegal in CA and you wont pass smog.

 

I'm registered in Texas.

 

still illegal in all 50 States and could prevent resale of your truck.. but, it's your truck ... go for it.. you will also have to deal with 02 sensors

 

Cat deletion doesn't really do much. If anything, just replace it with a High Flow unit. But still... don't see it doing more than, say, getting a tuner...

 

Guys on the ranger-forums were removing 1 or 2 of the numerous that came on the 4.0L without throwing a code.

Is it illegal to remove smog equipment? Absolutely. Can you do it without anyone noticing? If you don't throw a code or fail e-tests, maybe.

 

Only illegal to remove it if it's not broken. How else would they get replaced?

 

And this proves it

http://www.ford-trucks.com/forums/12...eco-boost.html

They actually lost 5HP going from catted to catless.

 

All valid points. Modern cat technology has come a looong way and they can hardly even be called restrictive anymore. The only real "benefit" that you would see is more volume, which most people can get by modding the post-cat components.

They're referring to removing it permanently (straight pipe), without the intent of replacing with a new unit.

Interesting data, and notably on an ecoboost, which hypothetically should react better to open exhaust than an NA motor. We have also seen a good study by grassroots motorsports that tested stock vs high flow vs test pipe on a miata and the max hp gain on high flow and test pipe was 1-2 max.

 

agreed, you want that vacuum right after the turbo to pull the exhaust out. My guess is the air is stalling after that.

fullrace saw a loss when then ran open header VS their cat back. I am sure you guys would see the same thing.