Exhaust - Gutting Catalyst

[Walshe8]

Question for guys with some experience with catalysts on 1995 4 Runner w/automatic.

The engine or transmission seems to loss power around 4k rpm and will not shift like it used to. I can rarely get above 55mph with full throttle and 5 straight, flat miles of pavement in front. 2 days before the problem started I used a can of seafoam in the brake booster to clean the intake .

Any chance I burnt up or melted the catalyst? Since its not shifting right any more and seems to feel like it builds up back pressure when I get on the gas?

Other than emmissions/smog tests, is there any other problems with gutting the catalyst? It seems like it is a simple bolt on/off part.

 

[RotaMan2]

I run mine with no cat. Open 2.5 " exhaust all the way to a flow master 40 series. I have no problems not even engine code.

 

[coloradodave]

I want to buy a new one to i can pass emissions ( i havent tried yet but....) then remove it.


any more people do this?


-codave

 

[the_dingman]

I replaced my cat a few weeks ago with a straight pipe and a few clamps... The only problem I have is a resonance around 2500 RPM that makes my truck sound like a ricer.

No emissions in Wisconsin (outside of the far south-eastern corner), so I'm good.

Noticed a good power increase on it.

 

[coloradodave]

I replaced my cat a few weeks ago with a straight pipe and a few clamps... The only problem I have is a resonance around 2500 RPM that makes my truck sound like a ricer.

No emissions in Wisconsin (outside of the far south-eastern corner), so I'm good.

Noticed a good power increase on it.

Do you have a stock muffler?