1985 22RE 4Runner

Live in Florida. No emission requirments.

I got the original Catalytic Converter still. 200K+. Have not inspected it yet. The question assumes it is clogged up and impeding exhaust flow.

Should I....

1.) Remove and not replace
2.) Replace with OEM
3.) Replace with High Flow Cat

I want the exhaust to run it's best. I don't know enough about back pressure or exhaust, or how that will effect performance.

I prefer the noise to not annoy me or other peeps on the road. I don;t mind a little exhaust tone, but I don;t wanna be 'that guy', if you know what I mean.

But in the end I am mostly concerned with optimal function and performance.

I have LC Exhaust Headers and the rest of the exhaust is stock, with a few leaks

Not ready to do anything yet, but addressing the exhaust system is on the horizon.

 

Off topic- but what part of Florida you in?

 

one test for a clogged cat is to use a laser heat gun, measuring temps right before and right after the input/output of the cat, at maybe 2500 rpm, so it's nice and hot.

if the temp differences are starting to approach 100 degrees, there could be a problem with the cat.

 

Ever followed a car around with a cat? Gives you a headache. I'd rather no be 'that guy' than the noise violator. Just go with whatevers cheap, believe the 49 state magnaflow cats aren't that much. While you're at it, do a full 2.25 inch exhaust, wake those headers up.

 

Now, you should investigate whether you actually need a cat, my 81 has close to 188k and it passed CA smog last year, so age and mileage doesn't mean its thrashed yet.

 

I agree. When i had a cat on my exhaust my truck smelled far worse than it does now. I have a 2.5 inch exhaust that starts from the stock header flange I cut. I coupled that with a cheap Thrush Turbo muffler. Sounds great! Is not too loud. heck mine sounds better than my friends barely has a Toyota sound anymore...could be the camshaft though?

 

Cut and section in a new piece of pipe. Or stick a pry bar through it and make your own high-flow cat. LOL this thread is a crack up

 

Lolz typing on my phone, missed the out in without.

 

They run like craps without a cat. I mean awful been there done that. They need exhaust velocity.

Had a 22re with a flowmaster and a gutted cat. Sounded good bit no pull you could tell it was crapping all the power out the tail pipe. Put a cat back under it and it actually had a power band again.

 

I mean we have all seen those Z71's with straight pipes. Make all that d noise and are slow as s

 

Yea, and that is why the drag race guys run cats, so they run better. LMAO...

Delete the cat and let er breathe.

 

Be a Mensch, keep or get a new Cat.

 

I'm running stock Cat and no exhaust after the Cat... truck runs great and sounds decent, that's the combo I'd use

 

Drag race guys adjust their air fuel mix. Go and adjust the air fuel mix on your 22re after you lean that mother out because you have no restriction on the exhaust. Oh that's right only a few people are smart enough to do that. Unless you want to open up the afm and toy with that it will run better with a cat.

If you do remove it don't punch it out unless you don't want $90 dollars from the scrap yard. Sell it and use that money to make a straight pipe and buy whatever muffler you want.

3.0 in my pickup has a cat runs better with a cat. I tried it with and without a cat. my 302 4runner is gonna dump out the headers because I can tune the mix through the carb.

 

Let's be realistic, the 22re isn't going to magically start making any noticeable amount of power by removing the cat (if it is functioning properly). Anyone who says otherwise is suffering from the 'I did a mod, it must be better, I know it!' Syndrome.
˟˟˟˟, after you get the cold air intake you'll totally be laying down rubber!

 

Are you telling me that my TrailGear and WabFab stickers don't give me extra horsepower???

 

50 hp per sticker!

Goin off that logic, I'm lookin at close to 600 hp on my back window. So how come I can't keep up with the 'vettes?

 

I was also going to say, though my '90 3.0 sounded good runnin headers and a hollowed out cat, in retrospect, I probably would have benefited form a little more back pressure that the cat would have given it...

 

Like i said...this thread brings the funnay.... You do want back pressure but IMO it runs best with a tractor muffler and no cat. Love the sound of mine. ha

 

If they're worth 50 hp, then the Dukes of Hazzard sticker must be worth 150 hp right?