Has anyone ever gutted the factory 348 converters?

I did this to my 355, but only to the secondary cats which are only used at high rpm. I didn't sweat the turbulence, just kept the larger dia. cat section in place.

 

Just buy the Tubi or many other varieties of straight pipes...I put them in my old car and they work great...They have both the o2 sensor and thermocoupler sensor holes already pre-drilled into the pipe...Just bolt up, screw in the sensors and go! thermocoupler sensor is useless without cats but its nice to know that it is still there...

 

Rodney,
To get the stockers apart you will have to cut them in half on a chop saw! Seems like a lot of work for little gain sir....................Scott

 

The honeycomb is surrounded by a type of wire mesh. If you destroy the honeycomb in such a way as to do minimal damage to the mesh, the mesh will be easier to remove. You can remove it from the opening with needlenose, vicegrips, dynamite, whatever. If it becomes wadded into a ball, it's hard to get out of the opening. There's a baffle in the inlet which you may not be able to remove.

 

Unless you enjoy cutting metal things open with a die grinder

 

tip: don't grab and pull the internal mesh. Grab and shake the cat off your pliers and it comes out really fast like 5 minutes. You'll see...give it a try

 

My 360 coupe had a tubi and GUTTED cats. Dont know how they did it but It was obvious Illegal But LOUDER THEN HECK.
My buddies said they could hear me coming a mile away from there house.

I had a tubi and Hyper flows on my spyder and It was Not as near as loud as those gutted cats.

 

I would never do such a thing. Poisoning our planet with more greenhouse gasses. Shame on you.

Who invented the converter anyway? It was a quick bandaid fix in 1975 when all USA cars where still carburated. I argue to this day that EFI with O2 feedback, there should be no Catalytic converters, EGR valves, various check valves and vacuum ported switches. Just a bunch of bureaucratic save the planet BS.

Rodney, since you want to install a tube through the cat, you should not have to remove the wire mesh, you can if you want. Take an air chisel and knocked out the metal deflector, then break out the honeycomb. Then you should be able to install your tube and tack in place. It will retain the factory look your after. It just won't sound factory anymore.

 

Man, this sounds like an awful lot of work. First, the factory cat is obsolete cat technology, heavy and restrictive. Second, there are so many upgrade options that this would be my choice. In fact, this is what goth and I are doing.

 

Rodney ,

On my 348TB `90 the cat`s are both empty-ed...(by previous owner)
It is a bit louder, but I hear no distorsion or turbulance... And I should know: I used to be in the muffler bussiness.

Regards, Ben

(still can`t get the spelling right..)

 

I have gutted cats with tubi. I love the sound.
Bee Jay