cat question

[CHANCE]

hey guys dumb question time how can you tell if the cat bad on a car

 

[MistaScott]

You fail emissions.

If it is too old, it can seriously back up the exhaust and cause glowing red headers, turbo lag, lower boost, etc.

 

[Dan Thompson]

If you pull it. It should look like a honeycomb. I can't remember what the material is but it can make you sick so ware some gloves, gogles, and mask if you are going to start messing with it.

 

[DKREDT]

Originally posted by CHANCE
hey guys dumb question time how can you tell if the cat bad on a car

If it still has the honeycomb crap in there.

Yank that puppy off and "gut" it, unless you have emissions testing. I beat all the cuts out of my cat with a hd long screw driver, into a garbage can. You may want to wear a mask to keep from injesting and of the dust.

HTH


Joel

 

[Ormand]

I beat the guts out of my original, and noticed NO difference in performance on the street. Then I replaced it with a high flow cat from ATR, and replaced the downpipe at the same time. Now I can pass emissions tests without changing the exhaust. For racing, it is easy to mount a cut-out, just in front of the cat. If you ran alky, or somehow manage to use high boost on the street, then you might notice a big gain from ditching the cat, but some folks go pretty fast running through them.

 

[kjhansen]

Cae Craft put a pressure gauge on the exhaust pipe in front of their cat ('93 Chevy truck). Should read about 4psi (backpressure) according to them. Theirs was reading 11 psi. Their cat was in bad shape when they pulled it. Kinda the hard way to do it, but you don't have to pull the cat.
Keith