good deal. now make a dual 3" with X pipe and sell that and make some money!

make some test pipes that have 2.5" header flanges and expand to 3" to match the exhaust as well.

you'd sell the heck out of them! pm me if you could really do that

 

i probably could do that, but i wouldnt make them out of 3". i know everybody wants 3", but i really believe a dual 2 1/4 or dual 2 1/2 system would outperform a 3" on most of our cars. 3" is a little too much unless your making alot of power through turbos and such, or a built motor.

if your really interested, pm me and we can talk about price or whatever. it would just be alot of work because i would have to take out my whole system and then reinstall it after making yours. but i would do it for the right price... and i gaurantee you would see better performance out of a 2 1/2 system than 3". definately not on overall hp, but torque and overall perfomance for sure.

 

some more pictures for you

 

you should dyno versus a stock 08 now.

nice work, although you have done something unique/custom it is unlikely that you made much if any power. a lot of research goes into power-gaining exhaust, not just first instincts.

 

Interesting. I commend your DIY attitude and the respectable result.

I have a thing against making a $50 exhaust to put on a $30,000 car, but to each his own.

 

ive gotta $35,000 dragster w/ a $15,000 motor, and i fab my own stuff all the time... what are you trying to say??




lol i know what your gettin at bud.

 

so if you have a $35k drag machine, you must have access to a dyno or two. get to it

 

Isn't the oem mid-pipe diameter like 2.36" or 60mm? You went with smaller piping? I would've went with 2.5" at least.

 

Ha touche! But ya...a little different. Nice dragster, can I take it for a spin?

 

Nice work.. i'm not a fan of singles on a Z but it's impressive to see a custom build..

 

if so, the difference would be minimal at best. and with all the farther i went back on the exhaust, it wouldnt have made a huge difference. maybe a hp or two. believe me i thought about it, but i didnt want it to look goofy going from 2.25 to 2.5.

i actually have access to an engine dyno, which wouldnt really help the Z's case lol, but ill look into a chassis dyno around here. how much does it usually run for chassis dyno's?

apothyosis: any time bud.. but ill warn ya, its addicting!

 

so you went with a single 2.25"??? well since it was cheap, at least it will be cheap to redo at the adequate size

this chart (ive seen charts with basically equivalent numbers everywhere) says if you base on engine size, your single should be at least 2.5" and if you base on HP you should be at 3". It also says ka24de is an idiot that knows nothing about exhaust size. bigger than 3" single on an NA z is for retards



Edit: just wanna make sure you knowim not trying to knock you. the work looks good, just a bit undersized. and if youre not mandrel bending you oughta go a little bigger anyway, since the exhaust is only as big as the smallest pipe and crush bending takes that pipe down to like 2" diameter

 

come on, I'm sure you know a tuner or two that will run a dyno for you.

chassis dyno runs usually $30-100 for 3 pulls with air/fuel ratio

 

hoooper: thats a cool little chart. i know that 2.5 is for sure better, but like i said, it wouldnt have been an omg! difference with as much tubing as i replaced. when i start some engine mods, im planning on 2.5 duals with a custom x-pipe. so well get there.

wired: im pretty old school with the racecar, in the fact that i dont worry about max hp. im a super class racer, so max output is not a big factor. im more of a reliability kinda guy. but now with the Z, ill have to take your advice. im gonna run it at the next race, which is august 7th, and i think i can push her into the 12's if the humidity stays low.

 

Are you suggesting that KA24DE's let out as much spent gasses as VQ35's? It's nothing new to use a 3inch exhaust, and make a lot of power on a N/A KA (dyno proven)
So if you think a single 3inch pipe is enough to support 400hp, I think you are dumb.

 

and i think your a f***ing jacka** but were not calling each other names now are we...

i never said you couldnt make power on a single 3". what i said is 3" is too small on a stock Z to keep any low end torque.

i would love to see you waste your money putting a single 4" system on your car. not only will it look f***ing retarded, but it will be way too big.

son, i dont know how old you are, but your probably older than me, even so, i gaurantee you ive been studying performance longer than you. i know my sh*t, and until you man up and say your wrong, maybe you should shut your f***ing mouth!!!

 

So we agree that you are a supertool, and 3inches is too small for real performance.

 

Now, now.. play nice.

If you guys want to argue over something so stupid as this, do it through the PMs. I'm not asking. Next person between the two of you to post something negative gets a nice vacation from the forums.


Here's my opinion if you guys even care..
Personally, I think both of you are rather unintelligent, or at least very misled, the more I read your posts in this thread alone. Noobs arguing each other over the internet = FTL.

For N/A applications anything bigger than 3" in diameter for the piping of a single exit exhaust will result in overall loss in power. You may notice an increase in peak hp and/or tq, but the overall hp/tq (especially in the low RPMs) will be in the negatives. Don't you think there's a reason why exhaust companies don't go bigger than 80mm OD for N/A single exits? There's a reason why the other types of exhausts for N/A don't have huge OD. There's a reason why there are separate exhausts for FI applications (such as 3" true duals). And please define "real performance." Dyno numbers don't mean anything until you can back it up with hard evidence, such as higher traps, faster ETs, faster laps, harder turns, etc.

And who makes a single exit exhaust that has a smaller OD than stock? What's the point? You gained a little bit of horsepower in the very low RPMs and lost (or at least stayed very close to stock power output) power everywhere else. So much for saving money and making your own exhaust. Oh, and mandrel bent? Do it the right away, at the very least, if you're going to make your own exhaust. Don't cut corners.

Lastly, there's a reason why the stock exhaust is shaped the way it is. Just because you gain power from an exhaust, it doesn't mean everything is dandy. You now threw off some aerodynamics factors, as the stock exhaust acts as a diffuser. Why don't you two stop arguing, stop being so simple minded, and go read more about our beautiful cars?

 

Come on, It is his thread, he should be able to talk to me how he pleases.

 

ok, maybe i misled you 3hree5ive0ero, this mod wasnt super calculated to make butt loads of hp. i wanted a clean looking, good sounding exhaust, and i accomplished that. nothing against your opinions, and the difference in the two pipes is what? a few thousandths of an inch? im tellin ya, it doesnt matter.

as for the arguing, im over it. as for being unintelligent, no. not at all. i told you my purpose for the build up above, and i even said earlier that im gonna go bigger down the road. as for mandrel bending vs hydraulic, the difference is again minimal. especially with how i bent the pipe, not making hard bends.

a diffuser? i guess that gets screwed up with duals then right? do you seriously believe that the airflow under my car is gonna be all screwed up now because i changed my exhaust? and you call me misled?

i dont mean to sound like im being argumentative with you, because im really not. i just hopped into the Z market, and yes i may be a bit mislead about a few things. but ive been around fast cars for as long as i remember, and i know my stuff. no hard feelings bro, and thanks for your opinion.