I am finally getting rid of my cat. My question is will my computer get messed up or confused with out the cat?

 

Nope........Just makes it sound better

Later

 

**** a cat

 

When your car runs as good as mine thru dual cats, then you can remove them... A new high flow cat doenst rob any power. But it is an extra expense you dont have to pay for. Just watch out, because tampering with your emissions equipment is a $10,000 fine and/or jail time.

 

On our cars, NO. On later model OBDII cars, YES!
The factory cats can rob power but the high flow ones won't make a measureable difference. I've ran both "hollowed" cats, and now high flow ones. My times didn't change at all...but I got a little more "peace" of mind now.

 

On my car (92 Z28 350 TPI) I installed a Flowmaster muffler and was wondering why I didnt have the flowmaster sound. I removed both cats and the car now sounds great. I know its illegal but what is legal anymore!

 

I am thinking of taking the shell off the cat and welding it to my exhaust so it looks like one is there.

 

I have a 91 Z28 355CID. When I did my headers I had a custom no cat Y-pipe made. I added a flowmaster muffler with the 3" exhaust pipe and tips. I had a small section cut out just before the intermediate pipe just long enough for a cat. I bought a universal cat and 2 Walker clamps(the kind that are made of sheet metal and are about 4" long). When I go through emission tests I take 5min and remove the straight pipe and clamp in the cat. Get tested ,come home and reinstall the straight pipe. Its a really neat and easy way for me. If a cop suspects anything they send you for a vehicle inspection at a qualified shop and I just put it back in.

 

On TBI sometimes it will trip your SES for lack of backpressure to the EGR valve, but it doesn't hurt anything, not sure what type of EGR valve TPI uses, but I have been driving a '90 IROC around with no exhaust after the Y pipe for a month now (to broke to go buy exhaust and the factory stuff was rusted out and shot, so I just cut it all off) and no EGR codes.

Oh and when did it change to $10,000? It used to be $2,500. At $10,000, I'd owe the government hundreds of thousands, LOL. The upside to living in Nebraska, cops don't know any different and no emissions testing. It is so much easier to work on these cars with out all that **** cluttered up under the hood.

Martin

 

LOL thats brilliant
*claps*

anyway, Ive been reading in performance magazines that people that swap out stock Cats, with high flow ones are indeed getting HP increases of 10-20 hp.. but I'm not certain about that. I was thinking of replacing my stock one with a high performance after model one as I was certain it was choking my exhaust but after reading this I'm not so sure

 

My cat had an unfortunate accident with a MATCO longstroke airhammer....I dunno what happened a slip of the trigger finger and the catalyst was gone.....ooops.