Sorry, didn't ask those questions. If a few people are interested, I'll call him back and get all the details.

 

I believe the reason is acutally because the 2k,2k1 Y-pipe replaces both pre-cats, and the 2k2, 2k3 only replaces one pre-cat.




So 2k,2k1 owners, who is running the Warpspeed? I am not finding anywhere near the info I expected on the y-pipes.
Maybe I need to check the 4th gen forums for this info.

 

No. The 2k, 2k1 y doesn't replace any pre cat. The previous years replace only the right bank pre cat.

 

What makes the 00-01 not fit?

 

Would his price be $350 for the y-pipe for the 5.5? If so, I *may* be interested. I had to replace the catback when my muffler blew. The main cat looked just fine, so I left it. I gutted the cats a few months back after the dreaded P0430 code. What was inside was pretty ugly with everything pretty much entirely melted together.

My car is sluggish most of the time and performs like there's an obstruction in the exhaust. It feels similar to what a clogged fuel filter feels like. It starts to go, but hesitates intermittently. Occasionally it opens up when it's cooler outside, but that's even happening less often. I thought changing the MAF would do it, but that didn't have any impact.

So the only thing I haven't touched is the y-pipe at this point. It may be worth a shot.

 

What a horribly misinformed post

Thanks for clearing that up.
-----------------------------

I'm looking down the road to find out what way to go on my 01 AE, headers or just y-pipe. I think the consensus on the 4th gen's is headers aren't worth it, but they don't have the left bank pre-cat correct?

 

That sounds like my car. Most days it is just slow/hesitant. The exhaust noise I hear makes it sound like it is restricted. I have the cats but might as well to the y pipe. I'd like to do a catback also since my exhaust is twerked from being rear ended. I just don't want a loud *** droany exhaust.

 

While I'd love to do the whole cattman exhaust, all I've ever wanted was to have the expected standard power from my max. That's always been enough for me, so I'm not looking for the ultimate performance. So when my muffler blew, I replaced it with a Walker Quietflow and the matching resonator. Both shipped from Rock Auto was around $230 total. I've read that it's not as quiet as the stock setup, but I could never tell a difference. It's about as quiet as one can be as far as I can tell. I'd definitely recommend.

 

Wait a minute, I got the years mixed up. The 2k and 2k1 y replaces the right bank precat. The 2k2 and 2k3 leaves both precats in place. Sorry for the mix up.

 

For some reason, that's actually how I read your post. LOL.

Yes, the 2000,2001 replaces 1 precat only. You need to do headers to get them both.
I would still love to know if it's worthwhile to get headers on the DE-K though. Getting rid of one cat isn't a good enough reason IMO, maybe it does actually make a signifigant difference?
I'm in no rush t

 

I suppose you could always gut the left bank precat?

 

Personally, I would never gut a cat unless it was bad. Mine have less than 57,000 miles on them, I could sell them for a good buck.
Or Ill keep them so if I ever sell the car, I can swap out and sell headers/y pipe.
Or I can keep it in case I can't pass an E-test and have to reinstall.

Either way, I'll never guy those cats unless they're completely toast.

 

So an 01 pipe would fit right to the manifold, so 1 bank would need a precat?

 

Just buy some freakin headers and call it the day dude!!!!!!!

 

From what I found when searching is that I would need to be tuned.

So headers are what, $900
Tuning is $???
And the local exhaust shop won't touch nothing missing cats...

 

Headers - yeah around $700-1000 from what I see.
Y-Pipe - $350ish plus shipping.

Headers make the AFR different so you need a AFC also, added expense.

The question is, for a 2001, is it worth headers and all this bother just to lose 1 cat? We know it is for the 5.5.

The y-pipe shows signifigant gains by itself, and is much cheaper. The question remains unanswered.

 

I'll do y-pipe and catback, what the hell, right?

 

If your flex section is starting to fail, (like mine), then why not get a Cattman Ypipe. It's a lot cheaper than OEM and it never hurts to add 7 or 8 HP while your at it.

 

My flex is going and my car has symptoms that exhibit plugged cats.

Let's git 'er dun.

 

OK lets clear this up:

RIGHT BANK = The 3 cylinders that are against your firewall, when someone says 'right bank cat' or 'right bank headers' this is the location they refer to.

LEFT BANK = The 3 cylinders that are against your Radiator.


2001 - Exhaust Manifolds:




2001 - Entire exhaust after the headers:



2001 Y-pipe close up:



2003 Y-Pipe Close up



I need CONFIRMATION on the following from someone who has INSTALLED IT:

2001 Y-Pipe replaces Left or Right bank Cat? This seems to be a common problem question. Which Cat is replaced by the aftermarket Y-Pipe???



I apologize I'm sure this has been 'answered' but I really cannot find a SOLID answer anywhere

 

I have not performed this task, but I gaurantee you it's the right bank precat that is eliminated.

 

Looks like it.

I don't understand why it only replaces one though... the left bank cat bolts up to the manifold right? Why the heck wouldn't they just eliminate that one too?

If that's the case, I'd consider making a pipe to fit from the left bank header flange to the flange on the Y-pipe to eliminate the Left cat too.... Why hasn't this been done?

I'm going to call Brian tomorrow I think. I wish there was more info on the 00/01 y-pipes and headers. All the info on this forums seems to be 3.5 specific when you get into any serious discussion.

 

When you get serious to buy performance parts, they are only avail for 00-01

 

This Random Technology Metallic Substrate (Up Pipe Converter) is small and could probably be adapted for almost any Pre-Cat application. According to the specs. this converter is 3" Dia: x 9-5/8 inches Overall Length: Inlet Size: 2-1/2 inch ID; Outlet Size: 2-1/2 inch OD.

http://www.ultrarev.com/132-25001u.html

 

Edited, made thread for the info I've compiled.

Seek here for some verifications:

http://forums.maxima.org/5th-generat...ml#post7973818