thegreydog

Is there any reason to keep the cat on a 87 22re 5 speed. Mine looks to be original. I am heading to the exhaust shop tomorrow. Besides emissions, is there any reason for this to stay on the truck?

Jonnym

with or without the cat the performace change isn't noticable. it may be a slight bit better with it on- low end torque, due to back pressure.

and please keep it on, there is already too much crap in the air, and we all know it's getting worse.

thanks

Elton

here we go again just leave it on was put there for a reason

CoedNaked

leave it on.

thegreydog

No it's not here we go again. I was simply asking a question. Pros and Cons? If you insist on being a smart ass, how about don't answer. I am debating replacing it or piping it, that was my thoughts, you got that.... ok!

Thanks

FredTJ

- Cleaner air
- Federal violation, worse (penality wise) if you sell it without the cat.

YotaFun

He is not being a smart a$$
This topic has been discussed before.

I would strongly suggest you keep your cat,
it doesn't help or harm you,
and if you feel it does.
Then my SUGGESTION to you is that you find a high flow cat,
especially with the laws that are out.

thegreydog

How much do they usually run in a shop? This one is original with 179k miles, is it time to be changed? I installed the header after the HG and the cat in/out is like 2 inch. So it goes 2.5 to 2.25 to 2 to 2.25, so I was just figuring that could not be good.

JamesD

If you don't have any money, pipe it. Also don't have a loud muffler. That will only draw attention to the police and then they can fine you when they look at your exhaust for not having a convertor. You can get new convertors shipped to your door for $60 off Ebay. Years ago cats were expensive and I always bypassed my cats. Now I can pick them up cheap.

http://cgi.ebay.com/ebaymotors/ws/eB...2410349&rd=1,1

James

FredTJ

Why ?





Fred

notanymore

without a cat you lose bottom end torque and you will get small hp gains in the top end but no big gains and with the big fines you can get its really not worth it to take it off

yotasavg

i got a similar problem right now. id say get a bigger I/O high flow cat. but keep one in it's place if you've got to lose the stock one.

elripster

Of all the emissions equipment, the catalytic converter makes the biggest impact on tail pipe emissions. Keep it, it's the right thing to do. Besides, aftermarket high flow cats don't hurt performance.

Frank

thegreydog

See when I had my 85, several years back, it was well over $120 to replace it. I just dumped around $1k to get it running right I was trying to avoid excess expense, but if it's not that bad, then I will replace it.

I was always taught that it was better to be consistent in size all of the way down.

Any general muffler good for this application. The guy said he has the normal magnaflow, flowmaster, turbos......etc.

ovrrdrive

Ditch it...

thegreydog

I have a stage 2 cam also with a header. Is the exhaust too loud with 2.25 through the Magnaflow?

ovrrdrive

I don't have a header, but mine sounds great. It took a little getting used to but I love it now.

Where are you located?

thegreydog

Middle Georgia, below Macon.

bob200587

You'll loose a noticeable amount of power if you take it off.

KevinInSac

Yes, please leave it on, especially if this is your DD.