Four Catalytic converters

fastrev · Aug 24, 2004

I am new to Mustangs and while installing some new mufflers I noticed I had 2 catalytic converters per side. One is close to the header and the other just before the H pipe. Sorry if this is a dumb question it's just when looking at Jegs and Summit all the systems they show have only one per side. The car has an H pile and had Flowmasters on it. I don't know if the whole system is flowmaster.

Thanks

04sleeper · Aug 24, 2004

The stock H-pipe has 4 converters on it. Aftermarket ones only have 2.

90mustangGT · Aug 24, 2004

The 4 cat H pipe is a joke, I heard of some of the 96-98 models having 6 converters. On our cars, the first two cats are more or less pre-heaters and the second two are what does most of the work. Just an example of outdated emmisions technology. Modern, high-flow cats do not need two on each side to clean up the exaust gasses. They don't restrict the flow nearly as much as the stock style.

fastrev · Aug 24, 2004

Will getting rid of these and putting a newer 2 cat system make a big change?
I also have the stock headers, how much of a performance gain would aftermarket headers be?

Thanks!

90mustangGT · Aug 24, 2004

I would just get a new H pipe with the cats on it, it will be larger pipe and be mandrel bent, probally cheaper than having 4 cats cut off and 2 new one's welded on.

Big performance gain, it will make a difference, but a big difference, I guess that up to your idea of big performance.

04sleeper · Aug 24, 2004

fastrev said:
Will getting rid of these and putting a newer 2 cat system make a big change?

You will pick up a significant amout of power. Go here for some good quality exhaust. http://www.vrsexhaust.com/X-PIPES/x-pipes.html

fastrev said:
I also have the stock headers, how much of a performance gain would aftermarket headers be?

Thanks!

You will loose power with aftermarket headers unless you have head work done.

BlackFox5.0 · Aug 24, 2004

I think that the stock system has more cats because of the design of the cat. one pair is a 2 way converter, and the other pair is a 1 way. Newer aftermarket cats are a 3-way converter.

cevtv · Aug 24, 2004

fastrev said:
Will getting rid of these and putting a newer 2 cat system make a big change?

Check your local laws first. Some states, like CA, require the car to have the same amount of cats that it had from the factory, even if the 2-cat system runs cleaner. Check to see if you need to pass a visual inspection...........

ALMOST STOCK · Aug 25, 2004

cevtv said:
Check your local laws first. Some states, like CA, require the car to have the same amount of cats that it had from the factory, even if the 2-cat system runs cleaner. Check to see if you need to pass a visual inspection...........

Exactly.... 100% Correct

88stangmangt · Aug 26, 2004

cats bummed me out too so mine are sittin next to the shed................but if anyone asks yes i have em............

_jb_ · Aug 26, 2004

88stangmangt said:
cats bummed me out too so mine are sittin next to the shed................but if anyone asks yes i have em............

That's what I would do if I had a smog test here in MI. After the testing, I would put back on the goodies!

Four Catalytic converters

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