Exhaust Help

[gigabit240]

Hey everyone. I was wondering what you guys thought of the ebay exhaust piping and mufflers. I wanted to get a new pipe and muffler to replace the stock one I have. All I want is a quick fix. It doesn't have to handle turbo pressure or any type of serious performance mods. I have heard of some of the ebay turbo manifolds bursting at the welds, but I'm not doing anything drastic with the car.. for now atleast

I was looking at this one
http://cgi.ebay.com/ebaymotors/ws/eBayI ... 098wt_1165

You guys think this will last? If so how long? Theres not much info on it and I'm not even sure I'll buy it.. If you guys have had any experiences with stuff like this I'd be very helpful if it was shared.. All opinions are welcome with open arms! I don't care if I get flamed because theres better things to worry about then what people say over the internet. Thanks everyone

[OutToWinPAHC]

Your keeping it NA, 3 inch piping will make it sound like a turd and it will throw off the exhaust velocity and probably hurt the bottom end. You dont need 3 inch piping.... 2.25-2.5max

[motoman399]

^^ true story. they sound like crap usually with 3" N/A. as for how much performance and how long the exhaust will last, you will be fine with the exhaust. the exhaust may crack, but not likely. you will be fine with an ebay cat back.

the ebay turbo manifolds do not burst they crack. and its from the weight of the turbo, tons of hot and cold, thin walled stainless tubing, and welds that are fused (no filler rod). im sure there is more to why they crack but just thought i would explain to you that they dont explode under your hood like a power steering line lol.

[gigabit240]

Thanks guys I really appreciate it. I'm not going to buy this one if it sounds horrible. I'll start looking for a 2.5

[newton240sx]

i think thats bull crap. i run a 3 in ebay with obx long tube headers with no aftermarket intake or anything and it sounds aweasome. ive met tons of people who say it sounds aweasome for an NA and im not talking about rednecks. im talking about the opinions of nissan techs since im currently in school to be one. as long as your car is pullin in as much as its pushing out then theres no problem. 3 inch piping is fine as long as you have a muffler with enough back pressure to balance it out

[EnjoiNismo]

If your car is low and you scrap, the welds on a cheapy ebay exhaust will break. Happened to a couple of friends of mine.
But if your not low I wouldn't worry about that.

[motoman399]

i think thats bull crap. i run a 3 in ebay with obx long tube headers with no aftermarket intake or anything and it sounds aweasome. ive met tons of people who say it sounds aweasome for an NA and im not talking about rednecks. im talking about the opinions of nissan techs since im currently in school to be one. as long as your car is pullin in as much as its pushing out then theres no problem. 3 inch piping is fine as long as you have a muffler with enough back pressure to balance it out

forgive me. obviously you know all.

op you should go with a 5" diesel exhaust from what newton says.

newton, i had a hotshot header an intake, and a huge hks super dragger exhaust and it sounded good. but i have had a few friends with 3"ers that sounded horrible. if i was in the market for a cat back exhaust and i was going N/A i would get 2.5"

[newton240sx]

correct me if im wrong but I believe i didnt say anything about a 5in exhaust. all im saying is the 2.5 crap is bull. your right some ebays 3in sound like s*** but so do the ebay 2.5 in. you can be a poopyhead about it if you want but im just sayin you shouldnt go out and say a 3in is too much for an NA if you have no idea what your talking about. because from what I understand your just going off of what some of them have sounded like. thats some of them. not all of them

[OutToWinPAHC]

Its about the exhaust velocity 3 inches is larger then the intake manifold runners flow rate. With NA you want to balance them to keep the flow rate velocity the same or close. Now with boost your forcing more air and fuel in, so the faster you can get it out, IE free flowing exhaust, the better. 3 inch is overkill on a NA, low end torque will be affected, but top end gains will be had. I would say a complete 2.25-2.5 system would look, sound and perform best overall on a NA.

Now Newton, please post video of your exhaust.

[motoman399]

^^ what he said. newton you said you have 3" but with the right back pressure muffler it will perform good. if you have a restrictive muffler then you arent getting anything out of your "full 3" exhaust." there is no reason to have 3" with a stock muffler. very little to no gains.

outtowinpahc is right, regardless of sound you will loose overall performance using a free flowing 3" on a N/A KA that hasnt had major work done to it.

[TheRealNap0le0n]

correct me if im wrong but I believe i didnt say anything about a 5in exhaust. all im saying is the 2.5 crap is bull. your right some ebays 3in sound like s*** but so do the ebay 2.5 in. you can be a poopyhead about it if you want but im just sayin you shouldnt go out and say a 3in is too much for an NA if you have no idea what your talking about. because from what I understand your just going off of what some of them have sounded like. thats some of them. not all of them

he's right... the physics of a stock N/A 2.4l engine are not condusive to having a 3" exhaust system. As previously stated the exhaust velocity will be hurt and it will kill the scavenging effect thus hurting performance...

and whom ever stated to put a muffler that has enough back pressure to even the system out... wow.

Back Pressure is the enemy, you want the correct sizing to balance exhaust flow and velocity while reducing back pressure.

I mean back pressure is a resistance to flow... so how is that in ANY way beneficial when you could have an exhaust that helps pull more clean air in while evacuating ALL of the spent gases.

I bolded what you said for emphasis.... dont go around saying things when you have no idea what you are talking about

[Raz007]

Well I can chime in with my experience. I have a 96, and installed an OBX header, test pipe, and the 2.5 inch HKS Hi power catback system. sounds great, not too loud unless you are at WOT. I noticed some power gains throughout the rev range, nothing major but enough to make it more fun all around. I'm glad I didn't go with a 3" system, as I'm not going turbo or anything, it would have been overkill imo.

[newton240sx]

oh really? so your car has no back pressure at all? because correct me if im wrong but an engine wont work if it doesnt have back pressure. you know why a car sounds like crap is because it doesnt have enough to even things out. and most aftermarket exhaust will go from either 3in to a 4 or 4.5 in tip . how about you look inside that muffler. i think it has a s*** ton of back pressure buddy. and most of the time when it sounds like s*** its because they dont replace the cat or they have leaks throught the stock downpipe to the car. and the stock piping is way smaller than the actual exhaust your putting on so it will get hardly any gains at all

[motoman399]

oh really? so your car has no back pressure at all? because correct me if im wrong but an engine wont work if it doesnt have back pressure. you know why a car sounds like crap is because it doesnt have enough to even things out. and most aftermarket exhaust will go from either 3in to a 4 or 4.5 in tip . how about you look inside that muffler. i think it has a s*** ton of back pressure buddy. and most of the time when it sounds like s*** its because they dont replace the cat or they have leaks throught the stock downpipe to the car. and the stock piping is way smaller than the actual exhaust your putting on so it will get hardly any gains at all

your going to make a great mechanic for nissan. they tell you exactly how to do it, no thinking involved...

your real tough on the interweb. please dont reach through my screen and punch me in the FACE! you and your 65 posts and 18 years of fury are scary...

[AZ89two4Tsx]

Dude, just get a 2.25-2.5" diameter like PAHC said. Anything bigger is overkill and really, just not necessary. There is ZERO advantage. It's way too big of a diameter, will hang lower, and be louder. It's stupid.

And whoever that newton guy is needs to stop his nut swinging and shut the hell up. He has no idea what he's talking about and must run a 3" exhaust shop, lol. Go take your obnoxious ebay fart cannon somewhere else buddy. There are no Nissan techs that will be impressed here.

[newton240sx]

damn man im sorry im cursed at you. did I offend your virgin eyes? yea im sorry I work and go to school and I wish I was as sad as you and could post more man. sorry I let ya down

[indomiekid1]

this is funny, 3" is fine, 2.5" is fine, they are both better then stock.

[motoman399]

And whoever that newton guy is needs to stop his nut swinging and shut the hell up. He has no idea what he's talking about and must run a 3" exhaust shop, lol. Go take your obnoxious ebay fart cannon somewhere else buddy. There are no Nissan techs that will be impressed here.

hahaha thats great

and newton i have been on here for almost 4 years now, and have had a 240 for almost 5 years. and i have a lot of information. i have worked at shops, i have done my own repairs. so pipe down lil guy

[AZ89two4Tsx]

this is funny, 3" is fine, 2.5" is fine, they are both better then stock.

[indomiekid1]

haha AZ, thats right! haha
This has been covered so much already.

[OutToWinPAHC]

Newton.... Backpressure VS flow velocity.... It should be in your text book.

[zsmizzy]

PAHC you just made my day.

[gigabit240]

Ok so I looked up some videos on youtube for a 3" ebay 240... They sounded AWFUL.. I'm deffinatly not buying one now. I can't believe I even concidered it lolz...

Anywhose... Thanks again guys

[scotty-2-forty]

I think mine is 4". Eat more, poop more ... that's all I'm sayin'.

[motoman399]

haha scotty, mine is also close to 4" its massive. but if you cram air in you need it to escape. so i get what your saying

[charat]

lol... i don't think ill ever be taking my car to newton if he's ever going to be a Nissan tech... must not have been in school for long. doesn't even sound like a professional.

[obg3506]

this is funny, 3" is fine, 2.5" is fine, they are both better then stock.

That thing is actually pedaling forward! LOL!