alright, i went to maxrev today (cattmans shop that makes all the parts) and talked to them about installing my y pipe...my y pipe isn't going to get here until thursday so i decided to talk to them about doing the custom catback exhaust that they wanted to do...so i convinced them to do it all for cost...they said they have already thought out the design and have the piping...basically they are using a full mandrel bent 2.5" pipe from the cat and there is a 24 inch resonator on this pipe...at the end will be a muffler of my choosing...well, not a muffler of my choosing, but they are making the muffler for me so i get to pick how loud i want it, what kind of tip i want etc.

it is made out of 304 stainless just like their y pipes...i am getting charged $400 for the full custom exhaust, muffler, install, and install on the y pipe...i think this is a pretty good deal...he is charging me $300 for just the piping w/ the resonator and the pipe apparently has o2 sensors on it...so he is charging me $50 for the muffler and install on the entire exhaust system and another $50 for install on the y pipe (it is normally an hours labor for the y pipe install which is normally $70)...i think i'm getting a pretty damn good deal considering an exhaust like this retails for about $1k according to them...i am getting everything for cost...after work on thursday night i am going in there for a couple hours so they can start and then friday before the arizona maxima meet i'm going in there...i told them they have to be done by 3:45 at the latest so i can make it to the meet on time...we are all going to the track friday night so i'll post my times up here that night...i'm still deciding whether or not to dyno...i would have to dyno before and after which means 2x$65...which is $130...owner of maxrev said he will split it w/ me but i still don't know if i want to dyno it...gotta think about it some more...already forking over $400



now, info on the headers...he told me they are planning on working on headers for the car but since this shop only uses 304 stainless, they will be very expensive...he is not quite sure how much they will add because he doesn't have any sort of prototype that he can dyno yet...for those of you that have a y pipe, apparently a set of headers will get rid of it...he said wholesale on the headers is probably about $900 which means they will go out selling for about $1300 and they wanted to get them done before stillen maxima day so they could have them there

 

So what is your points? Are they gonna make a Cat-Back system for 5th gen maximas or not??it seems like they are doing it for you and not sure about going into mass production for the public???
and if they are thinking selling a cat-back system for 1k retail, they better think it over again..cuz nobody is going to buy it!!

Tim

 

sounded like they are going to start selling them for the public...remember, cattman is always more expensive because they only use 304 stainless...for people that live in cold climates, this is very important because exhaust fumes are one of the most corrosive things in the car and stainless (especially 304) holds up to these much more...i can understand that a lot of people don't want to buy it because of the price, but lots of people will want to buy it becasue of the build quality...i agree and think they would sell a lot more and make a much larger profit if they made this in normal steel or something (along w/ the headers) but they only make stuff in 304 stainless...o well, i'm getting a great deal on the exhaust and if they want to make business decisions like this, there must be a reason...they must be making plenty of money (the owner of the shop has like 6 cars)

 

I would be very surprised if the catback exhaust makes any notable power whatsoever.

Ive mentioned this before, but we dynoed a 2k Max 5 speed with Cattman Y pipe and Stillen intake and it put down around 203 wheel hp. We then dumped the ENTIRE exhaust after the cat and promptly put down about 206 hp to the wheels. Any exhaust at all will show less of a gain than none at all.

Also of note was that NO low end torque was lost at all without the exhaust system. So much for that theory on these cars! Also, so much for Nissan's fancy "variable back pressure" muffler. It doesnt do a dann thing on the dyno.

 

Was that a Y-pipe that eliminated one of two pre-catalytic convertes(50-state Max) or was it a FEDERAL spec Max with only one cat?

PLEASE explain more details like who you are, what criteria you used in your tests(dyno type,etc..) ALL the parts you've dynoed and the results, PLEASE!! Some dyno charts would be GREAT! I had a feeling about most of the results you posted above, but I've never found hard proof.

 

If above statements are true, can someone Please tell me how the hack can you get 5/8 Wheel HP by just replacing with HKS muffler?

And magazine has dynoed it too, with some gain with just HKS muffler unless they were BS!!!!

Thanks
Tim

 

The car that was dynoed was MaxGator's. His car is a 2000 SE 5 speed with a Cattman Y-pipe and Stillen intake. It is a Federal spec car in which both pre-cats were eliminated with the Y-pipe. Stock the car tested at 191 hp, with the Y-pipe and SI 203 hp, and then with the exhaust dump 206 hp. The run without the exhaust was done on the same day, same dyno as the 203 hp baseline runs. In fact, it was done about 10 minutes after (we gave the car a cooldown).

I will see if I can get the plots from MaxGator, or have him post them in this forum.

As far as how HKS made all the extra hp from just a muffler.....thats a mystery to me.

 

If you want dyno plots, click my sig for my car. These plots are with the Cattman Y pipe and the Place Racing CAI, on an otherwise stock fed spec 2000 Maxima SE.

Ill dig up a link to my bone stock dynoplot and post it here in a few minutes.

All the dyno tests Ive done (over 100 tests....but not all on my Maxima) have been on a Dynojet 248C, and all figures re at the wheels. All the Maxima tests have been in 3rd gear.

 

Heres a plot Mad Max when stock. The highest run is when I yanked the airfilter and left the airbox open. Not really practical for long term use, but it did make power.

http://homestead.juno.com/madmax2k/f...00baseline.jpg

 

Heres a plot of 3 different Maximas. Two are stock, and one has a Y-pipe and SI. Guess which one is the Cali spec?

http://homestead.juno.com/madmax2k/f...ynooct2000.jpg

 

Dude is there THAT much of a disparity in cali spec cars? I really hope the cali spec one isn't the one running 180 lb-ft of torque cause i would be really distressed to find out that my car makes almost 10 lbs-ft less than fed spec....please explain that last chart, i'm dyno dumb i guess dunno how to read it.

 

Yep..that the Cali spec car. But, I negelected to mention one caveat about this dyno run. The Cali spec car was fitted with aftermarket 17" wheels which were quite heavy. These wheels undoubtably showed some level of loss on the dyno.

However, I have also driven a Cali spec car, and the midrange was much softer than my Fed spec. Im not sure if this is unique to this Cali spec car, or all of them. But, I noticed the "soft" midrange immediately.

 

No doubt, Cali Spec cars have less power than Fed Spec in case you guys didn't know, according to Toyota data, for Camry, Cali spec has average of 2-3hp less than Fed spec cars that Toyota sells!!!

Glad not living in Cali...all those damn emission regulation is killing the performance cars!!

 

Mad Max tells no lie (before its time that is). Unfortunatley, the site I decided to store my dynos on dumped everything. However, I still have them and will dig them up and post them tonight.

I won't get into the argument over the HKS exhaust b/c I never saw the article. But, I believe our dyno showed a 3 hp gain by dropping everything after the cat. A 5 hp gain could have showed up on the dyno they did - just simple variation. ESPECIALLY, if they did not smooth the results or if they were talking at the crank.

If you've seen any of the max dynos, there is a spike at fuel cut and if you don't take it out, hp ends up much higher. In fact, I think when I did my first run with y and si, without taking out the spike, it showed something like 207.

I'm not accusing anyone of fixing the results, but it wouldn't surprise me if liberties were taken regarding the results. I mean, WE'VE ALL SEEN THE STILLEN CATALOG HAVEN'T WE?

 

Mr.Burner

Please do the dyno! Mad Max and I have done several dynos and although we paid for them, it was definitely worth it to provide the info to the max world. I think we were among the first to dyno our 2ks with and without mods.

Even better, if Cattman wants to sell any of these, get them to pay for the dyno. They ought to be more than willing to do that if they are confident that the system will be worthwhile.

Last thing, I wouldn't be surprised to see some results if the stock cat was taken off. Seems to me that the test MadMax and I ran suggests that the cat is the most restrictive part of the exhaust system.

 

I am in MD and have cali spec emissions on my 2k max....In fact, all the new 2k1 maximas have cali spec emissions now. Really sucks.....