Removal of the rear cats...

mrjones said:
Bingo, just keep your cats that are cut off, and if you have problems, have the same shop put them back on. You could also take your car in and get a new inspection done and see if they check the cats visibly. If they do, you could have the cats taken out, put in a replacement pipe, and have bolt-in flanges put on your exhaust and on both the cats and the replacement pipes. That way you can bolt the cats in each year before inspection time.

I don't really have a desire to take my cats off, but I will say the two best sounding MMs I have heard in person both had only 1 pair of cats.

It could be worse. Some of the 96-98 4.6 Mustangs had 3 PAIRS of cats!

Do any of you other old farts out there remember back in the late 70s and early 80s when JC Whitney sold "test pipes"? Replaces the catalyctic converter "for test purposes only"!!! Hardeeharhar!
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My 96 and my 04 mustang both had 3 pairs of cats. Keyword, had. :D

Probably the best weight savings I've done to the 04 was putting in an aluminum prochamber, weighed like 800 lbs less than the stock midpipe. (or so it felt when the midpipe fell on my hand after undoing the last bolt - I was not expecting it to weigh so freaking much).
 
GetMeMyStogie said:
Has anyone tried running with 4 cats and no mufflers? If the cats eat up a good proportion of the engine noise, maybe the mufflers aren't needed.

That might come off as ridiculous, but I really am curious. If the main reason people remove cats is for more sound, wouldn't removing or swapping the mufflers also work?
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For about 3 weeks I ran no mufflers and side exiting exhaust right in front of the rear tire. Let me tell you.... after the 3rd week I could stand the drone anymore. lol

Black Machine said:
Does removing the rear cats make a code pop up or not?
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No.
 
I'm moving to Florida next year. They wised up and got rid of testing altogether. Not that I have any problems here, but just one less PITA to worry about.:beer:
 
Mest30 said:
Anyone know if you can delete the rear cats in California and still pass inspection?
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If they know the MM comes with 2 sets of cats you'll certainly fail the visual. Usually an MM in good condition will pass the sniffer test with both sets of cats removed.
 
Reek09 said:
I live in VA and I deleted my rear cats and put on flowmasters and everybody says my car is way louder than other MM's that's how they know its me! I did this about two years ago and no check engine light or nothing. I still have stock tips with the resonators and it still sounds like a beast. Even more when I get into it!
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Cool someone from VA did it. We have emissions test every 2 yrs. Was wondering if deleting 2nd cats would make me fail inspection but after reading this thread not so much. Great!

Sent from my Samsung Droid Charge
 
Mest30 said:
Anyone know if you can delete the rear cats in California and still pass inspection?
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fastblackmerc said:
If they know the MM comes with 2 sets of cats you'll certainly fail the visual. Usually an MM in good condition will pass the sniffer test with both sets of cats removed.
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:hmmm: Sitting here in my delirium I had a thought, for those of you who live in nanny states like California that have visual inspections would running two sets of free flow cats work to satisfy the DMV?:dunno:
 
Can anyone confirm the size of the pipe before and after the cat?
I've searched before and there's a bunch of different answers.
I want to use a chain cutter to cut the cat out and then use the exhaust band clamps they sell to attach a new pipe with.
 
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