djthelo

I am looking at getting a nismo CAI and a custom exhaust and I want to know if there is a noticable boost in performance or if my car will just be loud for no reason. Tell me you setup and how it feels

Hilbe

iTrader: (3)

Yeah. You get some performance with the Cattback. Not much, but some.

Why not get the Nismo SE-R exhaust while you're at it? Sounds like you're into Nismo.

Nismo116

iTrader: (1)

Cattman all the way

Fastmax05

iTrader: (17)

and that comes from a guy whos .org name is NismoXXXX...

but yea... i love my cattman y pipe and magnaflow muffs with my fujita cai... i felt a NICE difference...

anm6

iTrader: (2)

Nismo cat back FTW. No loud at all and looks

toodeep

iTrader: (1)

I'm in s similar situation. I just ordered the CAI (fujita). And was curious of the performance gains of the modified exhaust?? is it worth it?

anm6

iTrader: (2)

Your not going to see earth shaking gains. Maybe 5-8 whp but over the whole rpm range. I don't know anyone that has dynoed yet with the Nismo but I think someone is, Just don't remember who.. But you get a much better sound and look to the car. So yes I think it's worth it. Just my 2 cents.

toodeep

iTrader: (1)

I have some paint damage that need to get done first, Then the exhaust, then maybe wheels. thanks for the feedback...BTW anyone have a champaine mist hood lying around??

djthelo

is there a noticable gain in fuel economy

Fastmax05

iTrader: (17)

hahah NO... yuou will get WORSE gas mpg... u will be on the gas pedal more and more...

NmexMAX

iTrader: (22)

If you want real gains, wait for headers.

anm6

iTrader: (2)

Yea but the way things are going that maybe a long long time.IF they need a little something for now just get the Nismo and CAI.

GrimMax

iTrader: (4)

Everyone says headers are where it is... must be true!! lol

chernmax

iTrader: (15)

Headers FTW!!!

!PrjctMax!

iTrader: (38)

no loud=less performance...to some extent at least

That crimp is holding back power that should be there in an after-market exhaust.

If you drive like a civil person, then it might improve a little bit due to the freer flow, but otherwise, no.

Fujita 1-piece
Cattman exhaust with '07 mufflers...stealth...not as stealth as NmexMAX's OEM intake w/LR MAF and stock mufflers, but still stealth.

Why aren't you telling people to skip the pu$$y bolt-ons and go straight to what you have in your sig?

DeusExMaxima

iTrader: (1)

I actually got mileage gains with my Kinetix manifold. I think real gains are obtained with piggy back system after the bolt on is done. I think headers yield some of the highest gains, with cams right in there too, and lightweight flywheel for 6 speed people (like meeee!!). Cat back and CAI do help but not like people think. I think that Rover MAF conversion works nicely too with piggy back tuning too.

chernmax

iTrader: (15)

Because most should learn how to walk before running. My R&D cost may not be realistic for most, thus I will promote some of the best bang for the buck upgrades instead. I promote balance regardless if I choose a far right approach...

!PrjctMax!

iTrader: (38)

I was saying it with sarcasm

Shoey1

just curious chernmax, how much dyno time, tuning and r/d did it take to get yours were it is today?

mynamestephen

I noticed that most people are talking about the minor gains and the larger gain headers would give in conjunction with the intake and catback exhaust. I KNOW EVERYONE IS TALKING ABOUT CATTMAN HEADERS AND WAITING and even a guy tried the FLEABAY Header and that was a mess.

Anybody consider or have the ALTIMA SE HEADERS BY OBX or any other company.

chernmax

iTrader: (15)

The comment was for other members, I know you understand...

chernmax

iTrader: (15)

Honestly for the 6th Gen going for the bigger whp numbers at least 3+ years R&D or helping with new ideas and product testing. Well over 1g (cost) in dyno tuning to ensure the produces performed to their optimum potential...

SMOKIN'MAX

Nismo CAI was my first mod; I felt an increase in power at and above 4000 RPM, along with a mean growl. When I added the Cattman Y-Pipe and Catback exhaust, I noticed an increase in power and an even meaner growl. I'm addicted to the sound and am very pleased with these mods.

anm6

iTrader: (2)

[quote=!PrjctMax!;6359362]no loud=less performance...to some extent at least

That crimp is holding back power that should be there in an after-market exhaust.

I real dont think the crimp hurts at all. I'm gonna try to dyno soon. But I thought someone eles was getting a dyno done. The crimp push the pipe down but it speads out side to side to make up for the height.

DeusExMaxima

iTrader: (1)

[QUOTE=anm6;6362104]Um . . . .yeeeeah . . . . I dont want any crimps in my pipe.

!PrjctMax!

iTrader: (38)

[QUOTE=anm6;6362104]...the point of a *free flowing* exhaust is so that it flows more freely, and crimps in the pipe hold that back

VigilanteMax

iTrader: (4)

Without headers, the crimp does nothing. power is already lost by the time it gets to the crimp. The crimp in the nismo is very small compared with the OEM by the way. Someone posted earlier with a good explanation of "free flow" and the right diameter for specific applications. obviously if you have a 3" pipe, the free flow is counter productive so not always true.

Apollos2

iTrader: (16)

Agreed, I think the bigger "crimp" point is probably at the Y-pipe anyway. No one really knows why the crimp is present in the stock exhaust and the Nismo exhaust. It is removed in the Cattman Catback.

Some speculations about the crimp:
1. It is there for clearance purposes.
2. It is there to control the drone sound.
3. It restricts flow, decreasing power.
4. It restricts flow creating back pressure, thus maintaining the original low end torque that came with the car.

Some observations:
1. It is there for clearance purposes - - Thats what one shop told me when I asked them to cut it out and replace with straight pipe. The wouldn't do it. From a Nissan perspective this may be correct, the car is a little on the low side it seems anyway. They may have not wanted to take any chances. I'm dropped, I had it cut out anyway, haven't had any problems. I mean really, how much clearence do you lose? 1/8in.

2. It is there to control the drone sound - Not. Again, had my crimp cut out, everything else is stock on my exhaust. No difference in volume or droning. I think drone has more to do with the mufflers

3. It restricts flow, decreasing power. - I speculate the bigger bottle neck is in the stock Y pipe. That' why people feel a difference after the Y pipe is replaced. I felt no difference when I cut the crimp out of the B pipe.

4. It restricts flow creating back pressure, thus maintaining the original low end torque that came with the car - - - - I have my doubts. If that t is true, then anyone replacng the stock Y pipe should have lost torque. Also, it seems you aren't pushing so much air through the exhaust at launch vs highway speeds. (Maybe it's not about speed but RPMS, so I don't know) Bottom line I felt no difference when I cut the crimp out of the B pipe, high or low speed or RPMs.

My verdict: It was there for clearance, has little to no impact on our cars performance with bolt on MODs.

I'll take some pics and measurements but from the looks of it the stock crimp runs almost the length of the B - Pipe.

In the meanwhile here are some pics previously posted in various threads.


Hilbes pic of the stock exhaust


Courtesy of AscendantMax stock with crimp:


Nismo crimp:


Cattman: no crimp

Shoey1

whats the stock vs aftermarket exhaust diamter?

NmexMAX

iTrader: (22)

If the stock catback of a 5.5 gen can support 247whp, then I'm sure the 6th gen catback can support more, so that is all.

Apollos2

iTrader: (16)

Nismo exhaust diameter is 2.5.

I just installed my Nismo catback and the Cattman Y-pipe. ( I got rubber like i never have this morning on the way to work )

Anyway, since I had it all off the car I took a couple of measurements and pics of the crimp in the b pipe.

As you can see, I took the measurements in aprox the same location and the outside diameter is the same.






I had this installed at the dealership by their performance tech (he will be the only one in their shop certified to work on the new Skyline GTR), he showed me on the under carriage why the crimp existed. It's purely a clearance issue do to the proximity of gas tank bottom and the exhaust. He also pointed out how the crimp in the Nismo is only at specific point where the bottom of the car peaks downward. Unlike the stock system that has a crimp that runs almost the length of the B-pipe.

Fastmax05

iTrader: (17)

I got rid of my crimp and didnt notice a sound change ... or powr... but i feel better w/out it there :P


apollo... what did install run you at the dealership... <<< OUCH!

and why not do it yourself... ?

POST SOME SOUND CLIPS TOOOOO ! hahah

Apollos2

iTrader: (16)

It really wasn't to bad $70 for both parts installed. Glad I did take it to them, lots rusty bolts and soooo much easier when you can stand under the car. If I get some sound clips I will post them for sure.

VQPRO

iTrader: (1)

ground your motor is cheap, and it makes a differents also if you going to get nismo CAI and exhaust change your pully and lower the car more traction better response from those mods.

Apollos2

iTrader: (16)

Sorry VQ, were you posting to me? My car is already dropped, grounding kit and pulley.

VQPRO

iTrader: (1)

my bad