will a 3" exhaust really kill my hp if im not boosting? the reason im asking is i want an exhaust but i just decied to go turbo so i need 3". so i was going to get the exhaust now and save up some money to get the turbo.

 

shouldn't hurt too bad since stock is already 2.25". .75" won't really hurt

 

Your low end will definetly suffer a bit, cruizing around town, low end RPMS, ex. ex. Your high end will be alot better even when your N/A.

-matt

 

ok thanks guys think i might get the warpspeed one

 

someone was selling a 3" y pipe in the 4th gen for sale forum not too long ago. turbo is like 4gs by the way...

 

MagnaFlow's Frequently Asked Questions
Question: Why ISN'T a bigger pipe always better?

Answer: Don't be fooled! Bigger is not better! Many people think that having the biggest diameter pipe is the best way to make power.
Not true. Due to a variety of factors, extensive testing is required. We've dyno'd extensively and our systems yield optimum power increases. Some manufacturers claim even higher horsepower numbers.

It is a fine line to reduce backpressure while maintaining good exhaust velocity. It is not about getting the biggest pipe, it is about getting a more efficient pipe diameter while maintaining exhaust velocity.

There has to be a balanced design to enhance the maximum engine output, exhaust gas velocity, and sound. For example, imagine blowing air through a straw (comparing it to a smaller diameter pipe). This would take time to release all the air from your mouth, and you would feel pressure in your mouth while doing so. Now imagine blowing air through a paper towel roll (comparing it to a larger diameter pipe). You will relieve all your air much faster and feel little or no air pressure in your mouth because of the larger capacity of the tube. This is why it is important to get the correct size piping in order to relieve backpressure while maintaining thermal efficiency.

 

Isn't it good when everything is breathing freely? I would of thought that feeling 'little or no air pressure' is a good thing, because that means the engine won't feel it, therefore releasing the exhaust much faster and more efficiently..

 

to make good power u going to spend a lot of money. if i put together the setup my self it wont cost me that much. im going to make the pipeing.

 

JAY 25 I thinkn still has a 3" warspeed if someone was interested still

 

for sale? or are u just saying that to get a refence from about how it proforms

 

then why even ultra high performance cars don't go beyond 3" maybe some using 3.5"??

i did 387whp on my 240sx/sr20det using 3" but for the not so heavily modified n/a car 2.5" is more than enough

 

did you miss this post up there? yes he is selling it, I dont know if Jay 25 is selling one, buy I30driver is

 

I dont need a reference on how it performs, I already know. I'm informing you of someone who is selling one incase you still wanted to purchase one.

 

Listen man, I'll be straight with you. Think of how long it will actually take you to save money to complete a turbo setup. You have to find someone to custom fab you a feedpipe and a dumptube if your dont want a loud setup. You have to buy a turbine that is most likely going to be around $900+ unless you buy some used junk or some chinese junk. After all of this is considered, you realize that its going to take much longer than anticipated- and the whole time your 'saving', your running around with a 3'' exhaust system and civics are jumping you on the holeshot.

Im just telling you from experience, if your going turbo get a y-pipe for now and a muffler if you like rice, and when it comes time for turbo run a 3''.

 

what i posted wasn't really a statement, it was more of a question as to 'why'


so....why?

 

Alright, I'll help you.

Think of it like this, when exhaust gas velocity is maintained a sort of 'scavenging' effect takes place. This actually helps pull exhaust gas out of the combustion chamber and moving along with the rest of the exhaust stream. With a 3'' system on an all motor vq, the velocity would not be high enough to produce this effect and it would be a dog until around 4300rpm or so when the vq starts to truly breath.

 

im also trying to get an exhaust for my 97 GXE. so what really is the best size to go for? I was just about to jump on a 4" HKS Dragger with a stainless y-pipe combo I saw on ebay earlier so might that be too big? im hearing everybody say 2.5 is more than enough so whats the best choice?

 

hey i got u bro. i understand what u are saying. i just thought i would get an exhaust so i can drive around and make a lot of noise. and trust me on this i have a guy here in jersey that is a wiz on nissans. i could have a turbo right now if i wasnt tring to buy a house. maybe u should look him up.