Hey everyone. Well I finally got the headers installed on my 2k2 Max. With the help of 2 other people on the org (Big thanks to Scott (Maxhopper97) and cullen(cullenj76)) the install took about ~10 hours. The headers come with an EGR port, that is for the 2k1 and 2k. Dont know about the 4th gens. But the 2k2+ does not have the EGR. So I had to find a way to plug it up. Problem is the plug would have to be metric and big. I decided to cut the port off and weld the hole shut. I did this at a local place here in Louisville that works on lots of welding. He did a great job and saved the coating on the headers. I talked to Brian about this and said he could get me a plug but well I was impatient . But the next batch of headers that he gets shipped in said will have the plug. so dont worry about that you 2k2+ guys. Car sounds great. Sounds like a 350z now but just a little quiter. Butt dynos are ok, but true dynos is what everyone wants to see. I dynoed first with the Cattman y-pipe, then dynoed with the cattman headers. I did 3 runs each, and took the best of both runs and put them together.

Dyno run of Cattman Headers vs Cattman Y-pipe


I can find differences of about ~30hp and 30ft/lbs right around 5600 rpm, it is a lot faster after around 4k, and then it really gets going between 5k-6k. Also not this is with the stock B-pipe and muffler. Also, when I was at the Dynojet place, the guy told me I had a peak HP of 237HP and torque of 234.5. The dots on the graph shows the greatest difference between the two dynos.

Here is the data from in excel format: Click here for Spreadsheet

I talked to brian about this data and seemed very happy with it. he also told me he has one more set of headers in and more coming in mid-October.

All I got to say. Is great work Brian on an excellent quality products and excellent service. This is why I have tons of Cattman parts on my car.

-Dave Honey
aka Fezzik

 

Wow, those are great numbers!! I full agree with your last sentence as well.

 

Great numbers....I wonder how it would sound with a Greddy catback.

 

WOW

This is AWESOME for us 2k2 owners! Thanks for the post with the dyno sheet.

 

Wow the VQ35 exhaust manifolds must be much more restrictive than the Vq30s

 

Those gains over the y-pipe are massive! We know that the y-pipe give about 7-8 avg hp gain from 4k-redline. The headers seem to definitely be worth the money over the y-pipe. A few questions.

Could you please give some more details about the method of analysis? Same dyno used? Was there only 1 run for each? Same gas/octane used?
Have we ever had a HS and cattman header comparison?

 

I know this will sound self-serving, but I'm serious when I say that the headers really sound best with Cattman Cattback exhaust. The resonator on the Greddy is just too small to manage the sound, and it will be quite loud. Tone suffers too.

I'm expecting the next header shipment around October 11. Also note that it will include a new 2004+ header design that we will be evaluating.

Brian C Catts
Cattman Performance

 

1234567890

 

I don't think they're more restrictive, its just that the stock manifolds (like the exhaust) don't seem to have been upgraded from the parts used on the VQ30DE. They're not nearly as restrictive on the smaller displacement engine.

Our catback exhaust makes lots more power on the VQ35DE than the 3 litre, just because the engine got bigger but the stock exhaust (and manifolds) remained the same.

Brian C Catts
Cattman Performance

 

very impressed by the numbers. i might hafta reconsider buying a crotch rocket and invest in these headers first. look's promising!

 

Do you guys know the gains from the headers on the vq30?

 

those are EXCELLENT gains in both regions. would it be safe to assume that us auto guys could expect similar results? this is even better to hear after people seem to be having fittment issues with hotshott, although i dont wanna start a flame war here.

brian, do you guys have a set price for these yet? or an estimate?

 

Very Nice! When is the 2k4 header coming out Bryan? Do you know prices? Im so excited, ive been going mod crazy lately and these have been my #1 priority to get once they came out.

 

Whoah~!

So these dynos were performed on the same day and same dyno, correct?

Did you get an AFR chart? If so, can you post it also?

 

The original prototype testing was done on a somewhat tired 97 SE, and we got about 20hp over stock. Very respectable - without question the most effective bolt-on for that engine, and they do better on the 00-01s - but not quite in the league of the results we're getting on the VQ35.

Brian C Catts
Cattman Performance

 

You'd get the same proportional results on an auto (if the headers increase power by X% on the 6M, they should increase power by the same % on an auto).

To say I was pleased with the results would be an understatement. I do not know of ANY other bolt-on part for the Maxima that even comes close to these results.

To be clear, the headers we dynoed on this 2002 are not a new design, they fit all 1995-2003 Maximas/I30s/I35s (+ the 04 I35). That said, the price (when the next batch arrives in about 10-14 days) is $825 (up a bit due to the deteriorating value of the US dollar against the New Zealand $).

Brian C Catts
Cattman Performance

 

Awesome results... time for me to start putting money into that piggy bank again...

 

I want some! But all I have is about 22 bucks? What do ya say? J/K Maybee my wife will be REALLY generous for Christmas this year? Either way, I will have them! What a great product!

 

great brian, thanks. for those kinda HP and TQ numbers, i can justify spending $825. finding someone to install them will be another story, ha.

btw, can we see any low end/low rpm gains with these?

 

Btw, what are the gains from having headers + Y-pipe?

Sorry if this is a question... I just hear so many different things....

 

These headers include a replacement for the stock y pipe.

 

the headers come with the Y pipe, they are basically one piece. so if you were planning on buying a y pipe, and then buying headers later...you would just save for the headers...you would get the y pipe if you didnt wanna shell out 800+ for headers...i was just informed of this the other day, so dont feel bad.

 

I set of headers includes the y pipe, a y pipe alone is just the bottom half the headers and doesnt replace the factory monifolds.

 

Fezzik,

Thanks for taking the time and spending the money on doing this. Great info.

 

The Cattman headers include the Y-pipe if i'm not mistaken.

 

Gotcha... so the headers comprise of the exhaust manifold plus the y-pipe, if I understand correctly... thanks for the info guys...

 

nice gains. i am very interested in them but need to save up first. also what kind of cattman exhaust is there for a 96 maxima? and more gians from it then a greedy sp2?

 

Yup...Headers and Y pipe together.

I also have the Catback. I absolutely LOVE my Cattman exhaust. The observed power increase is unbelievable and this exhaust looks and sounds incredible. I have a completely different car since I added the UDP and exhaust. I said the same thing after doing my suspension.

I get stopped everywhere I go. It wanted to appreciate it the same way others behind me do so I went to an empty industrial park with my 19 yo son. With me outside the car, I told him to take a series of runs back and forth on this long straight (and very wide) stretch of road. I had him start off with a couple of slow drive-bys build up to a few at WOT. All I can say is, "damn my car sounds awesome". I can't wait to get to a Dyno and the race track. If anyone is interested in talking to an extremely biased person who did a S#it load of research before buying, let me know.

I'm installing the DDE's and HID fog kit tomorrow night and adding the 8K low beams. Woohoo....ain't moddin' fun?

Trex




Trex

 

I do not understand with the whole dyno situation. Check out this link:
http://forums.maxima.org/showthread.php?t=291520

This particular car produced more torques & horsepower sw/the Cattman's Y-pipe & catback system.

 

Sorry guys. I had to read real quick through the post. I try to answer a few questions. Dynos were done different days. But the weather was very similar and humitiy about the same. I had to do the dynos different days cause it took 10+ hours to install plus a week for the ecu to update it after reset. Also Running 93 octane. Dyno's were done on a dynojet SAE corrected, done at the same dyno place. I'll post the humity levels and temps tomorrow. Right now I am at the med school studying for a test. So. Check back for an update tomorrow.

 

wow man,
totally impressive numbers there!

I'm sure you hou happy. I never dyno'd mine, but after my next batch of mods i really need to get myself to one. NY sux for dynos... they are few and expensive.

 

Has anyone done a similar comparison on a vq30?

 

Has there ever been a HS vs cattman headers comparison?

 

Similar gains on 00-01 Max?

 

what about what that previous poster brought up...that the y pipe and cat back made similar gains. is that because there was a cat back in the mix?

http://forums.maxima.org/showthread.php?t=291520

edit: he also has UDPs and hyperground (not sure if this actually does free up HP), so his gains are from the UDPs as well.

 

Yeah, I'd be curious to know those results too....

 

Hyperground doesnt really create more hp. i helps the engine out though on electrical issues. The UDP doesnt create hp but frees it up. This is without a cat back on my car. If i put a cat-back on it there is no telling what the gains will be but i know it will only be good. I did this just to compare the difference in the y-pipe and the header itself. Show's how much the header helps out.

 

wow..headers has 30 more HP than Y-pipe?

 

At 5500 rpm it does. That is simple amazing.

 

I second a Cattman vs HotShot comparison of the headers. I am all for Cattman, fittment won't be an issue and quality will be there as always. Calln John Spangler over at HS is like getting a hold of Elvis Pressley- impossible, so how are you going to tell me that is good customer service on HotShots behalf ? Anyone have a set of dyno sheets of Cattman headers on a 3.0L ?