cutting cat???

[dangeranger01]

That tube on the side of the cat comes from the smog pump on the right front corner of the engine.
The O2 sensor is located in the manifold BEFORE the cat.
As for those $80 cat's, don't waste your money. I had one last 2 years. Blew the guts right out of it.
You can't buy a used cat from a junk yard. It's against Fed. law.

+1, the tube just injects air into the exhaust to finish burning unbernt fuel in the exhaust. Just plug the tube, of remove the smog pump and get a shorter belt.

 

[Original_Ranger84]

The rule is ( as I understand ) you ( a shop) can not legally cut off a functioning cat. However if it is not working they can legally replace it with a "test pipe". I might be wrong as my info is from a few years ago.

thats a relief because mine was totally clogged and i just removed it and straight piped it to a flow 40.

 

[Ranger5.0]

Race cars don't have cats because they're not driven on public roads and don't have to conform to emmisions standards.

I've gutted a few cats in the past and noticed no increase in power. I would not do it again. In the dyno tests I've seen, removing the cat added between 0 and 1 HP.

HaHa.....Evan, that 1 hp that is "freed up" realy makes a difference with a small displacment engine thats driving on the highway.....wait, no it doesnt...it wouldnt even be felt, not even by the most well tuned ass dyno. Now, a pluged cat will reduce performance, for some reason people feel the ned to rebel the rules when it comes to emissions, like it makes them a bigger player "ya, well i dont have a cat so i have more power". Do some research, emissions equipment is there for a reason. These days gas engines have it easy, the new diesels need to have there exaust cleaner then the air being taken in at the filter.

 

[Dusty_Ranger]

hey im over in bc and on my 88 ranger and 89 cavalier z24 ive just removed the the cat and put in a resonator sounds way better and better gas milage

 

[Evan]

hey im over in bc and on my 88 ranger and 89 cavalier z24 ive just removed the the cat and put in a resonator sounds way better and better gas milage

If that's the case with better gas mileage, then your cats were clogged.

 

[Dusty_Ranger]

ya prolly but i noticed way better power over stock my other buddies got the same viehicles but stock and mine totally tool thiers lol