thats what I'm doing...

 

You dont think I can just do 3" catback with benefits?? I dont really want to reconfigure the y pipe and o2 bungs.

 

Yeah you should still see gains, I didn't realize how your setup was. I hope to see this done on your car soon, mine probably won't be getting on the car till late december/early january, I would like to do it sooner but I'm being laidoff from work around thanksgiving, hopefully I'll be able to find another job soon and keep my project rolling.

 

Here are underside pics:

 

Also, will I need to redyno tune it with Technosquare ($300 each time I think)

 

yeah in order to see the gains you will need to redyno and retune to see the full gains....I would do all the mods you want to do first before going back, like the new intake.

you have a hi-flow cat you should be good to go there. I think you would see only another 2-3 whp with the 3" cat if anything, so probably not worth it.

just a side question, you think you will ever run cams?

 

That's what I was thinking too. It's cool on the Mini Cooper and some of the smaller cars. The Stillen 350 kit looks good too. But on our cars those first pics you posted, it just doesn't look as cool as your dual quad tips. (I wish my Nismo has 4 tips)

If your goal is to generate power then maybe some thing like this might be better

http://www.mccordcg.com/mpp/pictures.htm

Or exhaust dumps: http://www.headerdumps.com/ Of course this doesn't supply daily driver power unless you manually switch the dumps.

Really how much weight are you going to cut vs the nice look of the dual exhuast? 15-20lbs?

As far as the 3in piping, I can't really argue with dynos but I know I've heard more than once that people have lost some low end going with Greddy and it may be due to the larger pipe vs Cattman and Nismo. You do have headers and just about, if not all the air mods available to our cars so it may work for you but is 3in catback is going to make up for 2.5in piping that runs from the headers to the catback? I guess I don't understand that part.


I'll give you this pic though, that looks pretty good.
This looks good too but I think it's because we are back to 4tips.

 

Thanks for your thorough opinion and ideas.

Weight: I will lose about 20 lbs , but when you add weight loss up, it all adds up. Twenty here, twenty there, and you can drop weight fairly easily. I plan on getting a Braille battery which will drop another 20 lbs. Just by removing the spare tire, lighter battery, on less muffler, Ill lose over 100 lbs!!!!

I do plan on getting cams at some point when I get brave enough to tear into the motor. I already bought an intake, but its similar to what I had, just much much prettier.

Ill probably retune after I get the exhaust. I have heard that 3" would lose midrange power, but the dyno proves that wrong. I suppose if I do end up losing power, that I could put a crimp in the pipe to speed up flow.

Im still debating on which muffler to go with. I found a carbon fiber muffler thats cool. I could go for the JDM angled muffler look. My thoughts now are to go with either single or dual round top, or maybe one large oval tip, and I want to tuck the muffler under the car, and Ill prolly paint it flat black.

Center exhaust would only work if I could cut out an area under the spare tire holder and run the exhaust straight through. For now, Ill prolly go to the right side.

 

Are you planning on selling your cattman?

 

I might sell it, depending on how the single exhaust works. I think some people are lining up to buy so anyone who is interested, if I sell, should PM me so I can start a list.

 

So you are just going to cut and seal off part of the B-pipe and remove it? Shouldn't be that expensive I guess. Looks like some of the other options are more expensive, if you were going to go that route, true-duals might be about that price range, plus you would have the option of pipine them out the side.

 

My plan was to have a 3" cat back system bolted to my y-pipe. Ill need a resonator and a rear muffler. I dont think center exhaust is practical to make, so Ill have it routed to the passenger side exhaust opening and block off the other exhaust opening.

I have been debating if I want the JDM look with the angled muffler, or a more stealth look, with a large oval tip

 

How does the 5.5 gen w/ 3" drives as a daily driver? The way Cattman headers/y is setup, I still think 2.5 is better all around for sound driveability and power.

Sorry to hear about your work situation. Good luck.

 

lol someone's got to pay for all those new equipment

 

The dyno shows otherwise, with gains all around.

I plan to go to Whittier either tomorrow or Thursday to get the exhaust work done. Ill have 3" mandrel bent pipe exitting out the passenger side rear and I havent decided on a muffler. Im going to a tuner shop called Anthony's so Im sure they have good choices. They deal with S2000s and many other port compacts. The idea is to make the muffler stealth - either by placing it where the rear split is now, or tucking it up under the bumper. I also plan to paint it flat black if its visible. I suppose a dyno is in order after this, eh?

 

of course deus.

 

Any opinions on partial throttle drivability with a 3" exhaust, as was brought to my attention?

 

you mean noise and drone?

3" exhaust should actually be quieter.

 

uhh actually it should be louder with a 3'' exhaust. least from my understanding...

 

well, actually it all comes down to the muffler and size of the resonator he puts on

 

Lucky for me the Altima has a 2.5 that comes stock with a single outlet. I went with a single 3" and just swapped bumpers. Easy as pie.

Drone isn't that bad. I went with a 5X8 14" muffler which is actually pretty small. I could've fit upwards of a 18" and gotten it even quieter. This setup is actually quieter then my 2.25" setup which was rediculous!


The 3" in action. This video was made before I made the bumper swap.

Some WOT action.

http://s2.photobucket.com/albums/y41...t=MOV00235.flv
There's the 2.25" setup I had which was LOOOOUD.

 

Single 3" on 2.5 4 banger????

 

nah.. check his sig.. 3.5,.. and watch the vid,.. if the 2.5 nissan motor drives like that i want one lol...

 

Ur right. I mis read it. Ill be heading to Anthony's Muffler in Whittier in about an hour. I have camera in hand. I am looking for mandrel bent 3" single exhaust with resonator and muffler. Ill see what kind of tips they have.

 

Good luck Deus ! Don't forget the vids and pics please

 

What's the address? I want to see this!

 

Got the address. What time?

 

i r waiting deus...no pics?

 

3" bump

 

Ok guys - UPDATE**** I was talking to the Whittier shop and I just wasnt feeling confident in them. After some looking around, I decided to go with Orange County Muffler (OCM):
http://ocautosites.com/OCMuffler/

They have mandrel bending onsite and they handle performance cars with no problem. He didnt lecture me on the pitfalls of using 3" pipe which will cause power loss like other muffler shops did. Instead he listened to what i wanted and examined the best way to accomplish it. We looked into center exhaust and he actually liked the idea. We determined for a couple of reasons that it is do-able but might decrease power due to the sharp bend needed to exit at the center.
I am having the exhaust start at 3" in diameter right behind the flange next to the cat. I decided to use 2 14" Magnaflow resonators to quiet the sound some as the headers are still very loud with the 20 inch resonator. Also, the 14 inchers are only 4 inches wider compared to 6 inch wide larger resonators so Ill keep my ground clearance.

All bends are going to be mandrel bent. I am going with a flange just behind the small chassis brace but no other flanges. Removal of the rear section should be extremely easy if I need to remove it since there is only one muffler and one pipe.
Speaking of mufflers, have I got an interesting story for you. If u ask 10 people which mufflers they like, chances are that you'll get 4 or 5 different opinions. I have heard all sorts of mufflers over the years and used many kinds too: Supertrapp, Magnaflow, Greddy, Remus, HKS ($$$$$!!!!), Borla, fleabay $hit, etc. Then my buddy Kamski told me to listen to a youtube audio/video of a Vibrant muffler. I did and I was blown away by the sound. They sound fabulous. They seemed hard to find and varied a lot in price. I asked Mike at OCM to find Vibrant but he couldnt get one easily. I was going to go with a Magnaflow 3" single offset in and 3" center out. I was concerned about the tip as I wanted a more stealth look but with a tip that filled the bumper opening nicely.
I settled for a large oval. But still not satisfied, I went hunting for tips in the evening. I went to Pep Boys and Kragens but they had crap. I then decided to try Superautobacs in Stanton. I went there but they said that they didnt sell many tips so they didnt stock much. I decided to browse a bit while I was there. I went to the muffler section to see what they had in stock. I looked down and saw they stocked VIBRANT MUFFLERS!!!!!! But did they have the right one? I seemed to remember that the part number I wanted was #1147. I saw that they had it. So I bought it. It is painted flat black for that stealth look. Im going to have them tuck it under and forward of the bumper as much as possible.
http://www.verociousmotorsports.com/...er-In-Out-1147

Im gonna pick up the resonators at the warehouse and be back at the muffler place around 9ish. Ill be there til they finish it which will be most of the day. PM me for my cell number if anyone wants to hang out. The muffler shop is in Costa Mesa. Look at the link above for address.

 

That's a lot of driving. I'll call you if I can make it.

 

Here is a sound clip of the Vibrant muffler on an 03 Maxima:
http://www.youtube.com/watch?v=NOTiP-lFfhM

 

I cant wait, im so excite!!!

And its only a muffler Tee hee hee

 

Sounds pretty good. The clip said he didn't have a resonator, you may be doing two though?

Here is a sound clip of the Dynomax muffler.
http://www.youtube.com/watch?v=abH8iCathkI
I like the sound and the look. It might be perfect for a single tip. Kind of "stealthy".




If only you could pull a single like this
(props to my man Gizz715 for on the 6thgen site for finding this pic)

 

Id love to have done center exhaust. Just too many routing problems and danger off melting inner bumper, etc. I do have an idea if I never want to use the spare tire holder again . . .hehe.

 

Yeah I like the Vibrant muffler sound....guess who else ordered the same one as deus

 

what is the status of this?

 

i am a newcomer to this forum but it is obvious that there is some misunderstanding about back pressure.

if the exhaust diamters are tuned to create a negative back pressure when the cam has the intake valves open it will give an inverse supercharger effect, thus increasing the amount of fuel entering the cylinders.

this is a simplyfied explanation and probably fraught with errors, but it is based on physics.

this effect is much more obvious in normally asprirated 2 cycle engines.

correct me if i am wrong.

doc

 

U appear to be correct my good man. By the way, its been years since I have seen the word "fraught" in a sentence. Refreshing indded. And of course welcome aboard!!