I went from a CAI with RT cat to the Y a year later. I got the Cattman SS Y pipe for the best quality. From the first day I definietly noticed a jump in power all over the rev band. Much more subtle down low in 1st and 2nd gears, but in 3rd 4th and 5th, whoah! My top end has really woken up! Before the car used to go to redline in 4rd 4th and 5th, but now it really goes! One day I jsut decided to blast off without thinking, usually when I do that I look down at my speedo while I'm getting into 4th gera and find that I am at 90 mph. This time I was at 100! And I didn't even know it!

As for the sound, before I just had the awesome growl of the CAI, now its the CAI with subtle additions. In lower rpms the muted growl now sounds more like a grumble. At hi rpms, it is just the CAI. The Y pipe has added a sound, but not volume, still pretty much the same loudness as before, the CAI is the loudest part. The Y pipe has added a grizzle to the sound, that's the only way I can describe it. Also when I decelerate in gear I also notice a new Y pipe sound, but its not over-whelming, I don't know how to describe that one.

Over all, this is one great addition to my setup, and I haven't sacrificed sound at all! When I cruise, I hear nothing, no CAI, no Y, just the VQ humming along.


Oh yeah, one caveat My check enegine light came one. The code was 0702, the 3 way catalyst, The forward and rear O2 sensor was more than 0.5 off, accordoing to the service manual. I reset it and it came back with the same code a couple of days later. Anyone have any ideas what I can do to permanently make it go away??

Let me know guys.

Thx

DW

 

Sweet dude I want a y-pipe soo bad. But damn almost 400 bucks directly from cattman. I hear what a y-pipe with a cone pop charger would sound like. Proly almost as loud as yours...

Did you install yourself ? Hmm, I didn't know the check engine light would come on for a y-pipe! I think MaximaDriver.com has instructions for re-setting codes. Or, danny b. or medic will proly respond to this with your answers.

When I put the pop-charger in I felt no low end gain. It must feel good actually accelerating faster and being able to feel it huh.

 

I just put on my Cattman a few days ago. Had some installation problems but it seems to be ok. I have a cone intake and also a stillen muffler and its pretty loud. There seems to be 2 resonation points where it is the loudest. At 1.5k the Ypipe gets loud and then at 2.5k the muffler gets loud and then after that the intake starts growling.

 

I had my mechanic install my Y. He's also lost as to what the check engine issue is.

Since my setup is stock B pipe and muffler, I don't get any other sounds from the exhaust, even with the Y pipe. If I change the B pipe or muffler, things will get really loud! I have a frined with the Stillen muffler and stock intake. I hear that muffler all the time! It gives a power boost, but you hear it as well as feel it all the time.

DW

 

Loud is sometimes good. I purposly made my car as loud as is leagly possible. When Im at a red light and it turns green and the mate infront of me decides to test my patience, I simply shift into N and rev it up...now that gets some attention. I went with the Stillen Y-pipe because it is the loudest. If you dont have a cat-back system you will not hear much of it. If you want loud, go with a 3" cat-back like I did. If you want it even louder, get dual exhaust like I did.

Kirk

 

hey thats cool.. how did u get a dual exhaust.. i dont know what that black box is under the car, u know ... its rite beside the spare tire holder... if you can let me know.. it would be much apreciated =)

 

Im not sure what black box you are refering to. If you mean the rounded black thing under the middle of my sig pic it is only a shadow. Since Im not sure about your question I will tell you how I did the duals:
1)3" pipe running from RT cat to "trubo tube"(acts like a resonator)
2)3" pipe from "turbo tube" to a V-Force Camero muffler.
3)2.25" pipe comming directly out stock exhaust position with 3.5" tip.
4)2.5" pipe running from other side of muffler around spare tire holder and out custom cut symetrical hole on left side of rear with 3.5" tip.

The pipe from the muffler back is different sized to make it sound the same from each tip, and it does. If you have any more questions dont hesitat to ask.

Kirk

 

I think the black box you're talking about is the charcoal canister, for venting fumes from your tank. It's like right under the left rear wheel. If you decide to move it or something, your chek enegine light will probably go on because its' part of a system from your gas cap all the way to the feul filter that the ECU monitors for emissions.

DW

 

The stock Y-pipe has two "pre-cat" catalytic converters built in. AFAIK the aftermarket performance Y-pipes don't have pre-cats. As a consequence there is an increased burden on the main Catalytic Converter. Sometimes the main Cat can't handle the load and you get the dreaded Check Engine Light. You may have difficulty passing the Smog Test.

 

Yup. No pre-cats. I knew that going into it, but I never knew I'd get the check engine light. As I understand it, the pre-cats sole purpose is to clean the exhaust when the exhaust is still cold, a point at which the main cat isn't fully operational. Once warmed up, the pre-cats are useless, and the main cat takes over the whole job. So, for smog tests, I think I'll pass once the engine is warm. Gotta make sure to drive it hard to the inspection station

My questions is, do alot of you guys with Y pipes get the 0702 check engine code regularly?? Is that something I have to live with??

DW

 

You mentioned your O2 sensors were off .5 - Did you replace them? Also, you have 3 I believe. One comming off of each bank of cylinders in the ypipe and one at the main cat. converter. Did you measure all three?

 

I had all 3 O2 sensors replaced. I haven't measured them, though. Are You suggesting that one of them may simply be off kilter all the time, causing the check engine light?? How would you go about measuring them anyhow?

DW

 

You stated in your opening post that "My check enegine light came one. The code was 0702, the 3 way catalyst, The forward and rear O2 sensor was more than 0.5 off" I know they send a signal to the ecu and I'm sure it could be measured but I don't know how. I wouldn't bother if they're new/ ALso, the ecu has seperate codes for the O2 sensors. I think it will even tell you if it is a front or rear. If you replaced all three, I would suspect what Daniel B. thinks, and maybe it's your main cat. Hope not. They are probably expensive. The one on my CJ was ridiculously expensive. IF you do need one though, I know RandomTechnologies is supposed to make one that is less restrictive than most (less power robbing) Good luck

 

Hmm, maybe the new sensors need to "break-in" so to speak. That's a good suggestion. I'll wait a while. My Cat IS a random tech cat, my original one is sitting at home if I need to put it back on, but i doubt I'll need to. The random tech cat was working fine for over a year. It was only when the y pipe and new sensors came on that the 0702 codes started appearing. I've reset the ECU 3 times already. I confirm the code before I reset it aslo, always 0702. It usually takes like 4 days to return. We'll see.

This ECU resetting makes me wonder, does using the screwdriver on the ecu rest the ECU completely, or does it just make the ECU forget the codes?? Maybe I have to completely reset the ECU by dis-connecting the battery for a day so that the ecu is "born again" learning everything from scratch. Hmmmm.

Thx for the suggesttions, DBM and Toolrocks

DW

 

Please read (or reread) the Sticky ECU Diagnostic Trouble Codes. Note that possible causes of Diagnostic Trouble Code 0702 include ...
- Three-way catalyst
- Exhaust tube
- Intake air leaks
- Fuel injectors
- Spark plugs
- Ignition timing

Therefore do not be too hasty in condemning the Oxygen Sensors or the Cat.

I have never heard of a "break in" period for Oxygen Sensors. If you can substantiate this, please provide a pointer to a repair manual, magazine article, Web site, etc. I'm always eager to learn.

Disconnecting the battery is not the right way to reset the Engine Control Module. I don't know how this grain of misinformation hangs on year after year. Maybe the Flat Earth Society has endorsed it.

 

I just love my Cattman Y-pipe. It's definately one of the best bang for your buck mods for power.

As for the O2 sensors, I replaced both in the Y-pipe and reset the ECU and my check engine light never came on again. O2 sensors don't need a break-in period.

I'm not sure what your problem is, but it's not a good idea to just deal with it. Cause when the check engine light is on, the car will run rich and it won't perform as good as it can. The week that my check engine light was on, I didn't notice a decrease in performance, but I did notice that I got much worse gas milage.

Good luck

 

Dis-connecting the battery may not be the best way, but it is a way, the Nissan FSM says so. You have to do it for 24 hours, but most people don't wait that long, so the ECU probably doesn't get fully erased for them. The screwdriver ECU reset method or the battery dis-connect for 24 hours achieve the same exact thing.

As for the ECU code 0702, although all those causes are possible, I eliminated intake air leaks, fuel injectors, spark plugs etc for the moment because they havne't changed. I strongly beleive that my 0702 code has to do with what has changed on my car, namely the y pipe and the O2 sensors. I may be barking up the wrong tree, once I know for sure that the error has nothing to do with my recent upgrade, then I'll attack the other possible causes.

Concerning the break in of my O2 sensors, maybe 'break-in' was wrong choice of words. I have new sensors running on an older car, the possibility of the ECU system not being completely in sync may be a factor.

DW

 

[spam]

For all those that are impressed with their new purchases, review them at http://www.maximaproducts.f2s.com!

Share the knowledge and the wealth!

Thank you for listening.

[/spam]

 

I'll review my parts for you.

Kirk

 

dw,


did your y-pipe come with new bolts? i received gaskets, but not new bolts. i'm concerned that my bolts on the stock y pipe may need replacing.

 

Just gaskets. No bolts.

DW

 

Why did u need to change the O2 sensors?? does this have to be done when u put in the cattman y-pipe?

 

I didn't change my oxygen sensors. I just didn't feel the need. Than again, my car is a 99 with 40K miles on it! I didn't have any check engine issues when I did my exhaust upgrade. I replaced y-pipe, cat, and cat-back at the same time.

 

No, you don't have to replace the O2 sensors. I just did it because the original ones were 100K miles old. They were still OK, too.

DW

 

Man, that sig is pretty freaking long...heh

But I don't see any reason to get mad about it...laugh.

IanS

 

YOUR BACK!@!!!!!@%!@%!@%!@%!@%!@%!@%!@%!@%!@%

 

Well, not quite. This is an old thread someone revived.

DW

 

I dont either. I am respectfull with it an post it once per thread or occasionaly once per page. That guy must just be raggin'

Kirk

 

people who talk trash via the internet are lame..like someone really would change their sig over a nasty-gram lol!

 

Why you gatta be hatin'?

Arguing on here is like arguing anywere, its just more futile

Kirk

 

yeah futile and funny. maybe that guy is a comedian??

 

Hahaha...could be

Mr. Miyage