upstatemax

iTrader: (15)

Attn Puppet, new vid of exhaust

Cattman Gen 3 headers, Highflow Cat, Cattman B-Pipe, stock muffler and Berk Intake w/ K&N filter.

http://media.putfile.com/Maxima-Cattman-Headers-

Interior Shot at WOT.

http://media.putfile.com/Interior-noise-

I have it posted in the compilation thread also, just want to make sure you see it and update my clips.

I swapped out my HotShot headers for Cattman 3rd gen headers.

Hoooper

now get on the dyno and see if theres a power difference.

cant wait to hear a 3.5 with these and see a dyno of those too.

nismopc

iTrader: (3)

Curious. Why is the exhaust only exiting the right tailpipe? When you blipped the throttle, it was only coming out of the right side.

Does not appear that the stock muffler is working properly. Shouldn't the secondary open up when at higher rpm's?

Puppetmaster

iTrader: (48)

http://forums.maxima.org/private.php?do=newpm&u=38928



































I'll update the sticky, thanks.

upstatemax

iTrader: (15)

Stock muffler is a valved muffler, when enough of a load is placed on it, it opens the vavle to let exhaust out both tips. It is possible mine is stuck shut... But I really don't care that much.

upstatemax

iTrader: (15)

I would have sent it in a PM... But we all know how much the stickies are always used... So I decided to make a new thread.

upstatemax

iTrader: (15)

Dyno should come in the spring once I get something to tune AFR...

Untill then I think it will be a waste since I know I am running rich.

nismopc

iTrader: (3)

Exactly. From what I understood, it allowed more exhaust to exit once the secondary opened. Wouldn't a stuck valve restrict the flow?

I would if it restricted the flow. Especially with all that you've done.

clayman88

iTrader: (1)

Sounds good. Have you noticed much of a difference in performance?

nismology

iTrader: (8)

There weren't enough gasses in the exhaust to open the flap because there wasn't enough load on the motor in neutral. It's not RPM-dependent.


Sounds very nice.

nismopc

iTrader: (3)

Got it. So only at WOT under load would the valve activate due to the increased pressure from the exhaust.

Rev'n in neutral = no load.

maxima0001

Very nice work, upstate....

Cant wait to see the dyno comparisons

Hoooper

not ONLY at WOT, but it can be at any throttle position as long as there is enough load, which creates more exhaust. really it will only open at higher RPM under higher throttle positions, but theoretically it can open anywhere in the RPM range and throttle range (thats my interpretation)

HotshotVQ35

iTrader: (5)

thought the new cattmans were G2? or were the G2s with the fitamet issues? either way, car sounds nice!

upstatemax

iTrader: (15)

Better low and mid range than the HotShots.

Very pleased with them.

upstatemax

iTrader: (15)

The G2 were the ones with a few fitment issues and an unreliable fabricator.

Brian changed fabricators and a little design change for the newest ones (G3).

HotshotVQ35

iTrader: (5)

who did your install in NY? i got HS sitting around..want to get them in...let me know or PM me..thanks!

upstatemax

iTrader: (15)

My brother installed them at the shop he works at.

knight_yyz

iTrader: (40)

I just installed the 3rd gen Cattmans on my 03, with the cattman catback. It doesn't sound much different. It is much quieter than I would have expected. Sounds nothing like steven88's car.

NmexMAX

iTrader: (22)

Waiting for clips

reeloop

iTrader: (3)

+1

get them up !

steven88

iTrader: (28)

so it's much quieter than my gen 1's?

In for some sound clips....

btw, nice vid upstatemax...i like

NmexMAX

iTrader: (22)

With respect to steven88's w/ or w/o the CM catback?


So who's going to be the first to dyno these bad boys?

upstatemax

iTrader: (15)

As I said... I am not going to dyno till I get a VAFC, it would be a waste for me to dyno right now since the car is running really rich.

I plan on doing this in the spring... around May or June...

NmexMAX

iTrader: (22)

Just wondering, how do you know it's running rich?

upstatemax

iTrader: (15)

Sparks plugs don't last that long on my car, and once I put on headers and it continues with the Cattmans my MPG dropped from an average of 21 --> 16...

Also, when the HotShots were pulled from the car... They smelled like solid gas.

The whole exhaust system reeks of gas.

NmexMAX

iTrader: (22)

Sure it isn't another related issue

But yeah, I hear ya. My car wreaks the same and my NB readings are in the 0.91+v range @ wot

Using Z33 335's w/stock tune FTL.

leeI35

Sorry, I have been out of the loop.....What's the difference between headers gens? Do the new gen yeild more power over the previous versions?

NmexMAX

iTrader: (22)

No ones dynod as of yet so we don't know


The first set of dynos proved that Cattmans did add significant power. The second gen showed nearly the same results as the 1st gen. But not many people dyno’d.

It’s hard to compare since the same car isn’t being tested under the same conditions (i.e weather, AFR )

knight_yyz

iTrader: (40)

I would post some vids, but I don't have a video camera. I will post dynos, probably end of march. I need to tune so saving up for the greddy blue and some dyno time. The headers are costing a fortune thanks to customs fees and exchange rates.
FTW, it does seem to pull harder. It was hard to do a WOT run because it was rush hour on the way home. And the roads are wet and I have snows on right now. Zero traction. I was doing about 40kmh in second gear and slammed the pedal down and the tires just spun.

knight_yyz

iTrader: (40)

Sorry I don't remember if steven88's vids were with or without catback on. He seemed to have some backfiring going on. When I rev it hard with no load it still sounds completely stock, very clean. I'll see if I can borrow a vidcam.

NmexMAX

iTrader: (22)

That’s how mine was….until I added a test pipe. Bu there is definitely a power increase since my 30 – 70 is much better (nearly .30 sec and 2-4 MPH, depending on my shift RPM).

Also, you’ll need to add a test pipe as well if you’re going towards the EMB/EMU for tuning, because, well, you know the rules.

Bung needed before cat. I suppose you could keep the stock cat and still have a bung before it.

Back to sound talk. Under load, the sound isn’t bad at all. I can barely tell I have any exhaust modifications.

I am looking into a different resonator though. Looking at louvered cores at the current moment

knight_yyz

iTrader: (40)

I just went for a long run on the highway. There is a bit of a drone at around 120kph, nut other than that I think I like it.

steven88

iTrader: (28)

you're exaggerating right?

upstatemax

iTrader: (15)

Started as soon as I put on headers... I did one mod at a time and it stayed the same.

Put on the headers... BAM... Gas guzzlin ****.

Everything else is fine; MAF, coils, fuel filter, tranny, air filter...

Not to mention that the Maxima is known for running pig rich after headers...

NmexMAX

iTrader: (22)

Mine went lean by adding an intake. By lean, I mean leaner than before I had an intake.