I have a 95 maxima. Years ago I purchase a y-pipe and hi flow cat. I believe both are warpspeed but its been like 5 years. I also purchased a warpspeed b pipe and had it welded in accordance with the y-pipe and cat I have. My car failed emissions due to the hi flow cat. I replaced it with an oem cat (used) and it was a lot shorter than the hi flow cat. It pulled the entire b-pipe forward because of the difference in cat lengths. It now rattles and my exhaust pipe melted the rear bumper cut out.

Obviously there is a length different between the years. My exhaust is welded to fit the longer cat. Which oem cat is longer? I need to know so I can go get one.

Also, I believe I need the one that has an O2 bung.

Thanks,
Matt

 

The one that has an O2 bung in the cat is 95. 96-99 have a separate pipe holding the sensor behind the cat, hence the 95 being longer.


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So the 95 is the only one thats longer than the rest? Interesting that it wasnt both 95 & 96.

 

For informational purposes, do you have the length of each?

 

My 96 has the bung in the converter as well.

 

Ill get the tape measure out when I get home from work. Then I will.

 

just looked in my walker exhaust book at work...95-96 have o2 bung in converter 12-1/2" oal...97-01 no o2 sensor 12-3/8" oal...dont think that 1/8" is your problem

 

So you are saying the over all length difference between the two is 1/8"? I hope thats not right. If so, I wonder what this hi-flow cat is for?

 

We should all know this.

 

I've swapped around cats from various Nissans and they are all the same length.

 

A high flow cat is not factory...they're universal weld-in so length of that was obviously made up by cutting either y-pipe or b-pipe before welding together...welded because it doesnt have the factory flanges

 

My bad. I figured they changed the sensor spot on the OBD2 swap, not the facelift. Made more sence to me, but oh well. I learned something new. Lol.


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I'm using a test pipe from an S14.

All Nissan specific (non stock) HFC's or test pipes have the flanges to fit our cars, and most all Nissan cars, and are the proper length.


Right: Test Pipe 2.5", Center 3" S13/14 test pipe, right, HFC. None are stock.




Some test pipes have flanges that are not welded to the body of the unit, so you can rotate them as needed.

 

The hi-flow cat is 13 5/8 inches. The one on my car is about 12 1/4 inches. Almost an inch and a half difference. So all oem cats are roughly the same length? This means to use one, I need to get the b-pipe re-welded?

 

Might be like the megan test pipe. I couldn't get that thing to fit to save my life. It was 13 5/8" also.

Stick with the 12" or so.

 

Well the problem is that its been on for a long time and I had the b-pipe welded to length in order to match the length of longer hi-flow cat. So when I put the oem one back on, now the b-pipe is too short.

Ok so the length of the OEM 95-96 cat is the same as the 97-99 cat?

 

I wasnt saying all high flows are universal but obviously if his is longer and welded in place it wasnt made up for Nissan and was a universal weld in high flow cat. Even if it is bolted in with flanges but is about an 1" longer its not made for our Nissans. O.E.M. or not doesnt matter, I work in the aftermarket parts world and deal with non stock parts all the time but they are made to O.E. specs. Thats what matters

Cant say for sure on the Nissan OEM but on Walker aftermarket made to OE specs about 1/8" difference is all...Basically the same

 

Ok, and just to clarify, my hi flow cat was not welded in. It was bolted in. My b-pipe was welded together based on the length of the hi flow cat, which is longer than the oem (97-99?) cat that I have on the car now in order to pass emissions. And now I want to just leave the oem one on, except that since its shorter than the hi flow cat, the rest of the exhaust is pulled forward causing problems.

I thought that since the 97-99 cat that I have is shorter, maybe the 95-96 cat was longer. I was not under the impression that the hi flow cat I used was universal. But if it is, it is.

 

Yes I am running a 95-96 cat with o2 bung in my 98. It fits perfectly.

 

Well bummer, looks like I need to get my b-pipe welds cut and then get it re-welded to the correct length with the OEM cat in. Any idea how much that might cost?

 

Obd2 swap? Lolwut.com

 

Yeah, the test pipe on the left of my picture was on my car for some time and I sold it to a 4th genner (99).

The HFC on the right in my pic also fits my 95.

 

95 was OBD1 then they switched over to OBD2 I believe in 1996,thats the swap he was referring to.

 

No 4th gen was obd1

 

My 95 is obd1, that is why I like this year more than the rest of the 4th gens. My CEL is on all the time and it never stops me from getting emissions done. My hi-flow cat on the other hand... did.

 

My 1995 MAXIMA SE is OBD1...Most cars weren't OBD2 until 96-97...all 97 and newer are

 

All 4th gen Maximas are OBDII. Federal law stated all model year vehicles 96 and newer are required to be OBDII. Nissan was a year ahead.

The reason they let you pass with your CEL is because your car isn't required to be OBDII compliant, but it in fact is equipped with OBDII. My 95 (mfg date 3/95) is OBDII, as are all other model year 95 Maximas.

 

I stand corrected I always assumed was OBD-I since I couldnt find the connector...Searched the org and sure enough there is an OBD-II connector on passenger side right by the computer behind and under the radio area...found it no problem just was looking in the wrong spot all this time...Sorry for posting misleading info

 

Since we are in the subject of exhausts, does the 95 Cat different for Fed or Cali? I have a Cali but need to find a cat converter.

 

OEM cats may have a different part numbers but 95-96 cats will fit and have the O2 bung.

 

Thanks as I confirmed with the dealer that it is the same for both. Also, the cat converter cost $704...

 

why cant you just get a HFC and weld in the bung? Thats what I did. Eff a test pipe, this vq30 is staying as quiet as possible lol

 

Magnaflow has one with the bung just weld some flanges on $70 and its 2.5 stainless