Im looking to change the cats out in my 99 f150 with 4.2 rather than cutting them out or gutting them due to the check engine light/02 sensor readings. Does this thing happen to have 2 cats (or similar) on each side after the header? Or does it just appear that way? Thanks.

 

If it looks like it has 2 on each side it probably dose!
Should be 1 big one and 1 smaller one on each side.
That's how the 4.6 and 5.4 are.
The most popular way to go is cut out all 4 and put 2 high flow cats back in there.

Phil

 

thanks, thats what I thought about doing I just wasnt sure if I cut out two on each side if I had to put in two on each side vs just one.

 

Just put 1 high flow cat on each side. And put your 02 sensors back as close to were they were as you can.
You will be amazed at the difference!

Phil

 

That what I did to my 99 4.2. I also had a fake flowmaster installed. It does not give a code to have this set up. It will still even pass a smog inspection. I want to put a tip at the end. I am not sure what kind of tip size or cut I want to go with. Good luck Ben

 

Hey I have a 07 4.2 litre v6 and I cut my cats out on my truck there's 2 cats towards the back and it has 2 resinators/collectors up towards the exhaust manifolds. If u do end up cuttin out the cats you can buy spark plug fowlers from your local parts store they work as a spacer for the o2 sensors so it just reads enough exhaust gas to keep the check engine lights off!