Which setup will work better for me? currently i have slp 1 3/4 headers and 3in cat (not gutted)and cat back, dual 2 1/2 edelbrock...and i can get a 2 1/4 true dual exhaust kit for my car no cat with 2 mufflers(of my choice) the headers i think are 1 1/2 in primaries which are small but actually they are the same size as the exhaust ports on my heads....so larger would probably benifit but who knows... anyways im wondering which one i would benifit from, i can think of it as 2 1/4+2 1/4= 4 1/2 vs. 3. but would that technically be right?....what do you guys think..

 

I think you should have stayed awake in math class.

The diameter of the tubing is important because it equates to flow area.

Flow area of a circular section is radius squared times pi - or diameter squared times pi, divided by 4 (pi is roughly 3.14159).

Try the math again. Don't forget, tubing is specified by outside diameter, so the flow area is less by the wall thickness (and each diameter has two walls).

 

You cannot think of it that way. You need to take the area of the pipe opening (assuming no wall thickness) when considering flow.

3" pipe = 1.5^2 * Pi = 7.065 in^2
dual 2.25" = (1.125^2 * Pi)*2 = 7.94 in^2

You can see that all that work to fab up duals only gains you minimal pipe size advantage. A single 4" will go much farther.

EDIT: Looks like five7 beat me to it

 

im not "fabbing" duals, i can get a kit for 135 bucks.... plus like 100 bucks for headers.... thats less than about 700 i put into the current system...

 

in fact anyone can get the kit, its made for dual pipes running in the stock location.... dynomax 89009 .....look it up... www.summitracing.com obviously it comes with no mufflers or headers. but headers are like 105 and mufflers, you can decide on that....

 

.

 

They exit both on the drivers side but you can easily have them come out both. my brother had it on his transam about 5-10 years ago. it seems that nobody knows that they even made it......

 

i looked into this but i have a hard time believing it is a bolt in system. i am sure there is some fabrication that has to be made. the clearance on our cars is horrible. plus they arnt mandrel bent either.

 

No fab. my brother has it on his trans am.

 

How about some picks?? I would love to see it......

 

go to www.summitracing.com and do a search for part number 89009 and itll show the pic of it.

 

double post

 

I saw that , I mean installed........

 

Oh ok i dont have any pics of it on the car but i can show you kinda what it looks like on it from underneath http://mysite.verizon.net/vze84hud/duals/ go down to the ones where the pipes run side by side, that shows a good example of it and both mufflers sit parallel to eachother in the back. that pic isnt of this system i dont think but i couldnt tell ya

 

You mean this one?........

 

Why couldn't you run 2 2.5 I-Pipes next to each other? I have been wondering that for some time now I would think it would fit with just minor mods. It would look like the pic above......

 

2 1/4 duals or 3" single? I'd take the 3" even though it will flow slightly less. Think of all the extra weight the additional pipes and muffler would have. So even if you gained a few extra HP from it, you'd probably cancel it out due to weight.

 

its not just a gain in hp, its also a different sound, but its not my choice i am just debating on what to do....and yeah it would look just like that, you could probably get one of your buddies to get the kit and be like "before you put it on" and bring it to a shop who can mandrel bend them for you and say you want the exact same thing exept 2.5.....possibly that could work, with some modifications obviously.....just a thought

 

what headers is that setup supposed to work with, anybody know?

 

this thread had the wrong p/n for the headers that go with the kit:
https://www.thirdgen.org/techbb2/sho...threadid=91099

should be 85012, but these headers have 1-1/2" primaries, so i'd have to say no on this...but maybe with SLP headers you could use the y-pipe that comes with it to make starter pipes as they are 2-1/4" also. Just thinking kinda out loud.

 

well my ports are 1 1/2 inches so why go bigger just to neck down at the collector?.....well i dunno i read all the arguements on the other post and i dont want to start one but....i dont know

 

Exactly.
Neither do I think you know.

"i read all the arguements on the other post and i dont want to start one..." ...then why did you start an argumentative thread?



Re: "why go bigger just to neck down..."
Thermal energy loss=physical change (density)
Though, I do not think our uses are quite that necessitating.

 

I meant 1-1/2 headers wouldn't work for me, that's why i posted the idea with the slp 1-3/4 headers and y-pipe.

 

I didnt read the other threads about it before, i looked but didnt see that one and so i figured maybe someone has had both plus im not sure how the other true dual system sounds on the car.

 

im gonna relace my exhaust this week.. im gonna get a pair of ACS hooker 2460 headers.. i need to have a ypipe fabbed up anyway if i get the hooker catback, would it be a pain to have these pipes modified to match up to my headers and then have two mufflers installed (just the pipes from the mid-pipes to the mufflers)? Im just trying to figure out what im gonna do

 

By the time you have a y-pipe fabbed up you could have the 2055's for the same price. If you do not want AIR you can contact ACS and they will get rid of it for you for a small add on fee.

 

I have a guy doing my y-pipe that is gonna charge me 100 for it no matter what (friend of the family) $350 for a good set of coated Headers with a good y-pipe? Its over $500 for the 2055 from ACS coated. I just wanna know if it would be any problem to have the 2 1/4" duals and modified to fit the 2460 headers (ie, has anyone on here ever even gotten the 2 1/4" duals with different headers than what they are designed for).

 

Yeah I keep hearing bout guys buying headers then they gotta mess around with y-pipe, cat, etc because all the exhaust stuff gets purchased at different times.

My advice, which was also someone else's at another time, is to buy stuff that all fits together.

I lucked out and got slp headers, slp y-pipe, and an additional fabbed y-pipe, and flowmaster cat-back (which should all fit perfectly together because I bought the guys entire set-up) for $400.

although none of the stuff is coated and chroma-fied, its still a great deal cause I got LCAs and panhard rod with the deal. including shipping too

 

meh, i just ordered the dual 2 1/4 system and two dynomax mufflers.. my exhaust guy is very confident about the system. oh and i ordered my hooker headers from acs

 

let me know how it turns out, keep this post alive for then or just post up on it cause i want to know how it sounds....

 

well, the pipes and mufflers will be here by the end of the week, i just need ACS to send me my headers and then the car will be going on the lift for installation

 

I haven't ordered anything from ACS, but from some of the comments I've seen it might not be such a bad idea to start that big novel thats been chillin' on the shelf or crack open that 1stgen scale model, because some guys have had to wait a pretty long time to get the headers they ordered.

Not trying to bash ACS. Infact, couple weeks ago I really had my mind set on a nice set of ACS coated 2055s. but I found a cheeper solution...

 

oh yeah, i know.. lol, sux too, but i really want the hooker 2460's and coated and i know ACS is a good product.. just maybe i will get them within a couple of weeks *crosses fingers*

 

I got true 3inch flowmaster duels on my camaro and it has a lumpy grumble that i just love!

 

mmmm... lumpy.:lala: :lala: :lala: