So Ive decided to go the custom exhaust way.

Ive spent about 8hrs looking through promising threads and after looking at "Zero350z" thread about his custom exhaust set up i was motivated to make my own ."WTX350Z" suggested a magnaflow setup that i essentialy stole but i downgraded it even further by not getting the polished stainless and gettin the satin finish mufflers. Saved a few bucks so why not.

I still have a few questions/concerns.

So if my understanding is right,
The Magnaflow # 11385 would go right after the stock cats
then after that take the piping all the way to the back until i get into the 2 mufflers in the back and i plan on using Magnaflow #12615 as the 2 mufflers and then using some kind of tip or even just use the stock exhaust tips.

I was reading that 2.5inch is ok for single exhaust but for dual it would be too much thats why i chose 2.25 but is there a big difference?which one i should use?


Am I missing something else here?

I want my exhaust to sound louder than stock, i dont really expect to gain any performance but would rather avoid loosing any. lol.

Heres what im aiming for



heres the magnaflow links to the mufflers :

http://www.magnaflow.com/02product/s...e=main&id=7786

http://www.magnaflow.com/02product/s...e=main&id=7836
Thanks for the input guys!

Also, I went on summit racing and the mufflers i needed are out of stock so i looked at this place called ALL EXHAUST.com and the seem to have the mufflers i need in stock and its free shipping and no tax(total=$229.62). Has anyone bought from these guys before, they seem kinda fishy..idk..just might be paranoid or something.

,Frank

 

let me know how it goes, this is one of my plans for next year. I think it would be pretty cool to have a custom exhaust

 

 

The key to any exhaust is scavenging, but you have to decide what rpm range you want this effect to take place and be there. When folks open up the exhaust with larger tubing, they tend to reduce this scavenging effect, but increase upper HP. It's a compromise. The volume of exhaust changes with rpm and without being able to vary the size by exhaust demand you have to pick what you want.

I too want a tad more exhaust note, but I'm not interested in upper HP gains, more so mid range torque. So I'm going a sleeper route. That is keep the exhaust looking stock, yet increase scavenging in the midrange area.

I just purchased a used exhaust system for the pipes and the muffler. The muffler will be the first step, I plan on opening it up and see how Nissan did the chamberin. Then make it more free flowing.

The key here is not to open up the piping too soon, if you do the exhaust pulse responds by expanding too quickly and loosing it's momentum. An infra red temperature sensor can be very helpful to spot problem areas, any slowing pulse will cause an increase in temperature in the piping. In the old days we used to use cheap paint and rev the engine up, the bubbling paint on a set of duals told you were the H pipe or Y pipe needed to be.

 

Yea i remember reading that while back when i was restoring my 73 Nova.
Someone told me to spraypain the exhaust and find where it burns up the paint and install the x/h pipe there. That was somewhat the plan...

I dont really want HP gain, i just dont wanna loose my torque(what really matters).

I came up with two ideas, one was in my orginal post, the other was basicaly the same stock set up but using 2.5" piping and installing the magnaflow exhaust(the camaro/firebird). Its alot cheaper and hopefully it boost up my overall performance.

Not sure which exhaust ima end up doing.

 

Well if you played with an old chevy, then you probably noticed the different header sizes available, primary tube. The 1 5/8 primaries were for everyday driving, the 1 3/4 were for racing. If you used the 1 3/4 for everyday driving you gave up lower end torque. Same holds true for our exhaust.

My personal opinion is that with the even fire engines like we have, the need for true duals is mute unless top end HP is what your looking for. I do believe that a better Y pipe would be beneficial, keep it single until about the location of the resonator or beyound and then split from there. Torque benefits are realized in the sections closer to the motor.

 

Right now I have an aftermarket Y-pipe and test pipes. I am about torque and not top end. I have a set of borla headers also, not put on yet. what do you mean by this. So in your opinion for torque is to stay single exhaust back and split it. But would a set headers do to this equation. Thanks again

So what pipes are you going to run, headers?, ypipe?, and cats/or test pipes? to a single? and split exhaust?

 

I'm still new to the Z world, been building cars for many, many years. I'm also very tight when it comes to spending, having built cars for well over 30 years, I tend to stay away from the hype and go with what works.

Headers are always a great upgrade, equal length, but the primary tubes need not be large, too large and you'll loose torque. Problem normally is that when they design headers for a unique application like our Z's, they are interested in top end. So the torque fiends get left behind.

I purchased a whole exhaust system for several reasons. I plan to make a jig that will allow me to mock up the same bends so that when I go to slip this thing in, it'll fit just right without having a long down time.

My plans are not set in stone yet, until I have enough time to run some flow tests on the stock pipes and see which way I want to go. I think the Y pipe has a great chance for some good improvement, but space is limited.

More later.

 

I would stay with single 3" from cat-back then back to 2.5" for outlet to muffler then 4" exits.

 

You may want to experiment with the 12615. Although it will generally make it quieter, it may or may not induce drone. You can't know until you try.

So don't weld it in without trying it first. You can use a torqtite sleeve clamp to hold it on for a few days of driving.

You can experiment with a straight pipe, small or large muffler for different sounds or possible drones.

 

That looks like a good choice, 12615. I take it you've played with it a bit. Did you try running these as duals or as a single were the resonator is. How have you tried it out, I'm interested.

 

No, I haven't used that particular one. I just know its good to leave options open for experimentation.

 

Is this to be different or to save money?

 

to save money and be different.
My buddy owns a shop and i went there the other day.

I was just seeing how much space there was to play with under the car and i put a flowmaster 80 series camaro muffler for now... cost me 120 for muffler and installation.

it sounds a bit deeper but not that loud, its a good sound for now atleast until holiday season is over and save up a few bucks for the dual. Ill keep you guys updated

 

Does the flow master drone?

They are usually pretty good at droning.

 

sounds like my buddys evo8 but with the z underlying tone.

the sweetspot is 3-4krpm tho..love the sound..but just a temp for now..

 

Would love to hear it, always loved the sound of flow masters but they tend to build more for the American V8 sound.

 

my thoughts exactly when i first drove it around. All my buddies have chevys with flowmasters and it sounds kinda like their cars. Its hilarious, the Z sounds like a mini v8 driving around..haha..

 

post a damn clip i am about to do it tomorrow

 

I just got my custom 80 series flowmaster. I added the muffler and deleted the resinator. I am satisfied with the way it sounds.