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Ok i already have that 3rd cat (as i call it [Y-pipe]) deleted but my question is will deleting my remaining cats cause the car to run way too lean and barely run? Will i have to get a tune just to run the car? Or will it just simply throw a code? Its already throwing a code because i have a 75mm TB on there so im not really worried about that.
 

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Why? Get some high flow cats, and don't even worry about them. I replaced mine and my car runs a lot better (170,000 on original cats, they weren't the best anymore) and I don't have to deal with O2 sims or codes.
 

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Ok i already have that 3rd cat (as i call it [Y-pipe]) deleted but my question is will deleting my remaining cats cause the car to run way too lean and barely run? Will i have to get a tune just to run the car? Or will it just simply throw a code? Its already throwing a code because i have a 75mm TB on there so im not really worried about that.
A 75mm TB should not throw a code. I would repair the code before I did anything else.

And as Nitemare said, there is no reason to remove the cats unless you're having problems with them.

But just my .02. :thumbsup:
 
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Discussion Starter #4
Well it says that bank 2 is running lean plus EGR is faulted which is on my list just waiting on weather to clear up. Well my thing with deleting the cats is that i want it to sound "throatier" which maybe high flo cats will do, i wasnt really sure. I already have a true dual exhaust with cherry bomb mufflers. However my question is yet to be answered, do i need a tune to drive it without cats? My friend seems to think that it wont run without them, that the car will bog out and die. However he also thinks u can just throw gears in a rear diff and call it a day without adjusting them.
 

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You don't need a tune you can just build or buy a set of MIL eliminators. The rear 02 sensors need to be faked out with the eliminators or a tune. Will it sound throatier and louder yes it will.
 

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Well my thing with deleting the cats is that i want it to sound "throatier" which maybe high flo cats will do, i wasnt really sure. I already have a true dual exhaust with cherry bomb mufflers.
I have high flow cats, true dual 2 1/4", and no mufflers. That will get you "throaty."
However my question is yet to be answered, do i need a tune to drive it without cats? My friend seems to think that it wont run without them, that the car will bog out and die. However he also thinks u can just throw gears in a rear diff and call it a day without adjusting them.
On the gears, I used the original pinion shim and original side shims, and checked everything and it was perfect. Backlash was a tad bit on the low side but still within specs.
 

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Dont ya love it when you get good and lucky on the rear end shims?? ive only ever once had that happen what is even better is the guys that think you can just hammer fit the .006" preload for the bearings on the carrier into an alunimum case. all that does is fill your rear end with shavings. you need to use a case spreader to do it right. and thats what i have too for the exhaust. high flow cats, x pipe, true duals and no mufflers and 3" stainless angle cut tips. sounds awsome!!! IMO the way to go for loud throaty exhaust
 

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Well it says that bank 2 is running lean plus EGR is faulted which is on my list just waiting on weather to clear up. Well my thing with deleting the cats is that i want it to sound "throatier" which maybe high flo cats will do, i wasnt really sure. I already have a true dual exhaust with cherry bomb mufflers. However my question is yet to be answered, do i need a tune to drive it without cats? My friend seems to think that it wont run without them, that the car will bog out and die. However he also thinks u can just throw gears in a rear diff and call it a day without adjusting them.
Where in the reasoning about this problem did you deduce that a lean code is the cat's fault? Catalytic converters do not affect the A/F ratio of the car, nor do they affect the way the car runs unless they are broken apart and clogging the exhaust.
 

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Wrong. The rear oxygen sensors do not affect the way the car runs at all. The CEL will constantly be on, but that's it.
Duh, I'm an idiot. I was thinking the fronts when I said that. I should have thought of that, my back O2's have set a code ever since I got the car and I've just ignored them because of that.
 
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Discussion Starter #11
Where in the reasoning about this problem did you deduce that a lean code is the cat's fault? Catalytic converters do not affect the A/F ratio of the car, nor do they affect the way the car runs unless they are broken apart and clogging the exhaust.
Never said it was. It has to do with my EGR being faulted i believe and I'm sure the 75mm TB does not help either. I want to delete the cats for the sound increase.
 
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Discussion Starter #12
Wrong. The rear oxygen sensors do not affect the way the car runs at all. The CEL will constantly be on, but that's it.
So basically wat your saying is that i can just delete the cats and dont need to buy the MIL eliminators at all or did i get that wrong? Cuz i was looking at like $60 for the pair.
 

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I just noticed: You're in southern California and you're asking about cutting off the cats?!??! :beek:

Is this for a non-street legal car?

Have you tried running straight pipes right off the cats without mufflers or anything?
 
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Discussion Starter #14
I just noticed: You're in southern California and you're asking about cutting off the cats?!??! :beek:

Is this for a non-street legal car?

Have you tried running straight pipes right off the cats without mufflers or anything?
No this is a daily driver. The shop i work at does smogging so im not really worried about passing. haha. ;) I had a friend with just straight pipes with the stock 2 cats no mufflers and it was really raspy. I want it to have a lil bit of a lope to it at idle. And sound healthy at WOT.
 

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Like many other guys here I have a 2 1/4" exhaust with high flow Magnaflow cats. I also run the center Magnaflow dual in dual out muffler with no mufflers in the back. This is a really good sounding setup. It sounds better than my 2004 Mustang GT. I wouldn't tempt fate in California. Just get a set of High Flow cats.

If you really want more sound, install a set of PI cams, or better yet PI heads and cams.
 

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I just noticed: You're in southern California and you're asking about cutting off the cats?!??! :beek:

Is this for a non-street legal car?

Have you tried running straight pipes right off the cats without mufflers or anything?
hhaha so true, It took me so long to find a place in california to cut off my 3rd cat. I actually went through my friend and his friends shop xD.

Anyways I myself wouldn't cut off my last 2 cats. MY CAR IS SO LOUD AS IT IS xD

My set-up consist of a mid mounted muffler with all new Y-piple underneath that leads to chrome tips. At times it sounds very good but in the morning when its cold it sounds like ass, i have to admit.
 

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PI Cams in a 1995?

If his car is a 95 he needs 96+ heads or PI heads to use PI cams.
Sorry this is off the topic of the original post, but is this true? Is there that much of a difference between the F2AE/F4AE (pre-1996) and F5AE castings that you can't put the PI cams in? They're all NPI, and I thought sure I've read where some of you guys have done the PI Intake/Cam swap on the 1995. This is important to me because this is a mod I'm planning on doing to my '95!
 

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The extra lift of the PI cams will cause interference problems on the early heads. I can't remember off the top of my head if you end up with coil bind or if you hit the valve stem seals.

But which ever the case, the PI cams won't work on the early heads.
 
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