I read a post before where the author said that one cat and the Y-Pipe would NOT damage the engine?

does this hold true for no cats?....im planning to put on the Y with no cats at all but that'll change really quick if its going to damage my engine

 

He mentioned the ECU might throw a check engine light and the car might/would go into limp mode. y2kse posted this.

 

so its best to put on a high flow cat?

 

But we still have the pre-cat to deal with... aren't you wanting to get rid of that?

 

well i asked the question before of cant we take the sensors and put the ones that are supposed to go before the pre cats before the cat and the ones that go after the precats after the cat and then they will sense a change and this should "fool" the ecu... now who wants to try it and tell me if it makes sense?

 

Hey kev,

I just got my Y-pipe and it came in 2 pieces is this correct. I need a little help.

Thanks

Thomas

 

My Cattman Y-pipe was one-piece. There were no issues with the O2 sensors. I've had it on for a couple weeks, now, and so far, no pesky check-engine lights.

I wouldn't remove the cat. If you eliminate back-pressure from the exhaust system, you will lose a significant amount of low-end torque. And your exhaust system will suddenly generate GOBS of noise. Cops have ears: Can you say ticket? Good luck with it.

 

That's correct... the smaller piece is for 95-98 models (99?).

 

So there will be one pre cat and the main cat in operatrion? Did you change any of your cats.

 

The one on the stock y pipe is removed, so you have 1 pre-cat and the main cat.

 

I am kinda worried about doing this But I know it will be so cool. What are the possible things that could go wrong. To be honest I am afraid to MOD my car.

 

Worse thing? Hmmmm.... the check engine light can come on after the install, the installer might break an O2 sensor, the y pipe might not fit, you don't have the correct gaskets so there'll be a hissing sound, the cops look under your car and notice a pre-cat is missing, etc. Does that make you feel better?

Nah, don't worry about it. Everything I mentioned can happen, but highly unlikely.

 

OK here goes nothing I will go for it and let yall know how it goes.

 

bullseye...im relying on the 2k muffler for backpressure

i just want to know if this is safe

 

Will putting on a y-pipe void the factory Warranty??

 

Thats a very good question!!!!
Will this void the warranty??????

 

OK, I'll throw my 2 cents in . . .

First, in terms of removing restrictions in the exhaust system, the closer you get to the engine the better. By that definition, a Y-pipe will give you better performance than any other single modification you can make to the exhaust system.

Second, you cannot eliminate the front pre-cat without generating a check engine light. And moving the O2 sensors behind the main cat won't help. The reason is that it takes a certain amount of time (and heat) to fire up a catalytic converter. The CA/NLEV specification states that emissions must be kept below a certain level at all times, including when the vehicle is first started up. So the issue with CA/NLEV-spec vehicles is keeping their emissions under control when the engine is cold. The sole function of the pre-cats is to accomplish this task. They're smaller and closer to the exhaust manifolds so they fire up more quickly than the main cat. Once enough heat is generated in the main cat, it fires up and takes over.

So why is it possible to remove the rear pre-cat without generating a check engine light? I suspect it has to do with the proximity of the pre-cats to their respective exhaust manifolds. The front pre-cat is much closer to the front exhaust manifold than the rear pre-cat is to the rear exhaust manifold. As a result, sensor readings must be more critical across the front pre-cat than the rear pre-cat.

Third, installing a Y-pipe will not automatically void your warranty. Once again (or is it for the 2,376th time?), in order to void your warranty the dealer must prove that Y-pipe (or any other modification for that matter) is either the cause of or contributes to the problem for which you are seeking repairs. Having said that, when it comes to installing a modification that raises the possibility of voiding your warranty, I'd caution that discretion is the better part of valor.

 

i heard you CAN remove the front precat on FED spec ypipes which is what i have...

you guys are missing the question.....if i remove all of the cats will this cause engine damage?

 

No.

 

Oh... well the Y2K muffler will keep things fairly quiet, too. Good idea. I've seen a lot of posts describing this combo: hi-flow intake or CAI, Y-pipe, RT Cat, and stock Y2K muffler. I don't know why this setup would not be safe. I can't think of any potential peril this setup would create for your engine. If anything, the engine will be more free-breathing, and it will yield about 10%+ better gas mileage.
Not to mention better get-up-and-go! Enjoy...

 

Well you guys I was going to put the Y-pipe on but I ran into a little complications with it plus I was afraid of getting caught with it so it is being returned to Stillen and I will probaly wait until my warranty runs out before I try again. I'm not a big racer anyway so I won't miss it too much.

 

well the only reason i was curious about this is because i read y2kse's post and he was only refering to a ypipe with ONE cat on the vehicle

 

He later posted a summary of a conversation he had with a knowledgeable person. The person said our Max will adjust itself... I forgot exactly what he said.

 

Here you go, Kev:

http://forums.maxima.org/showthread.php?threadid=22667

 

Thanks for picking up the slack! Here's a flower

 

I need a little advice. I know this is getting old butt I am really afraid. But I have my Y-pipe and its just sitting in the floor. I look at it everyday saying to myself why isn't in on my car. Then I answer (don't void the warranty just send it back) then another part of me say's (put it on anyway and have some fun). The Y-pipe is illegal but why.... also if your car can still pass emissions why is it illegal. I called one muffler shop to have it put on and he said something about when you change the config. of the cat's it voids warranty's and subject to a 10'000 or 15'000 dollar fine. What would you guy's do in my situation.

Sorry for the book but I just want the best for my car.

 

The stock pre-cat(s) help reduce emissions on start-up. I guess it is illegal in California to remove the pre-cats for that reason. Once the main cat(s) heats up, however, the pre-cat's utility is nil. Your car will pass emissions testing with a y-pipe installed as long as the main cat is heated up to normal operating temp.

So...

- You *will* pass emissions testing.
- You *won't* harm your engine.
- You *won't* void your warranty.
- You already own the darn thing.

You are mere minutes away from adding 20-HP, a beefier sounding exhaust note, and snappier acceleration. Put it on. There is no down-side, and fun awaits you... Enjoy.

NOTE: Put on some pants, man. The wind keeps blowing up your skirt! J/K :-)

 

I haven't started yet but is the old pipe hard to take off because I don't have any power or air tools.

 

Not too hard... just a little elbow grease because some nuts are hard to take off. I suggest taking it to a shop, but if you want experience doing it yourself, you won't regret it. Make sure you have a friend with you if you do though.

 

Disconnect the battery. (When your y-pipe installation is complete, re-connect the battery. Your ECM will then reset itself.) While your exhaust system is still warm (not hot), spray the bolts/nuts on the stock pieces liberally with a penetrating oil, like WD-40. Let them soak for a while. Use jack stands for your personal safety. I agree: It's a good idea to have a friend help you. Don't start to remove your stock pieces until the exhaust system is COOL to the touch. Follow instructions, and you shouldn't have any problems. Hold off on the beer until you're done with the test-drive. Have fun with it.

 

If you need some help installing your y-pipe look in the "How-To" section of MaximaDriver.com or Mega Max's site at http://integra.vtec.net/geeser/megamax/. I can also e-mail you instructions for my Cattman y-pipe install. Remember, you can always replace the stock y-pipe.

 

I think I have enough peer presure to go ahead with the installation. Thank you, all of you!!!!!

 

Did ya'll with the Y-pipe keep the the stock be pipe or had one made and if you had one made did it contain the stock resonator or just plain pipe???

 

My GReddy cat-back system included the B-pipe, with a resonator...