I have Edelbrock ltb headers with 3" exhaust (no cat) with a crappy muffler and ugly turndown pipes, with a dropped in 350 crate. I'm at least going to put in a better muffler and better tips or is it worth it to get all the extra work done with true duel exhaust...

true dual is not needed for your application, it would sound different but not necessarily better, and you might end up losing low end torque

Not to be a **** but a true dual system will pick up more torque and hp in every RPM versus a single pipe, y-pipe system.


And it would sound butt loads better, in most ppl's opinions.

No it's not worth the trouble and $ in my opinion but some will say differently.

I just built another dual setup for my car, total cost was $150ca but took alot of time fabbing it up. Its a pretty simple setup, headers/s-bends/h-pipe/s-bend/bottle/dump infront of axle. The only thing i should have done differently was make the pipes a hair shorter before the bottles, the very tip of the turndowns nick the ground on the big bumps.


So its not a huge $$ deal to have duals unless you want duals right out the back, that could get expensive!

A single exhaust could never outperfomr a dual exhaust, ever.
i went with 3" duals all the way back, over the rear. I don't have very good ground clearance due to the fact that i'm running a T5, so i couldn't go beside the tranny, I had to go under the crossmember, with CATS then to the X pipe. But usually it's the over the axle part that scares most people, which we had lots of room to do ours. I'll be removing the CATS for some 2" more of ground clearance so everything will be alot nicer. And it definately sounds alot better than the single system.

damn straight, over the axle looked like a PITA!

But i imagine a full dual straight out the back would sound even better than dumping infront of the axle.

I also went under the X-Member and have not much clearance under there but like i said in my earlier post, only the turndowns tap the ground and they have pretty much the most ground clearance out of the whole system!

my cats are what hit, with them on, I only have about 2 1/2" of clearance. If i remove them, I should be able to pull the whole exhaust up atleast 2" more.

Why can't a single exhaust outperform a dual exhaust? What's the difference between a single exhaust and a dual exhaust with an X pipe?

Isn't it simply a matter of the area in the pipe? A 3" pipe has a cross sectional area of 7.065", where a pair of 2" pipes has a cross sectional area of 6.28".

Partly cross sectional area, but the x pipe provides a more efficient scavenger affect which works wonders. Now I wouldn't bother putting a dual exhaust on a car without an H or an X pipe. then it's basically just 2 4 bangers running single exhaust pipes basically.

how does an x-pipe provide better scavenging than a y-pipe? The low pressure due to scavenging should work the same as long as the cross-sectional area downstream from the union is the same, and the distance from the combustion chamber is the same or similar.

No...you can make just as much power or more depending on the setup with a single pipe. For the average joe a single is the way to go imo for these cars. You can buy a prebent system and install it in your garage.

Ive seen some good dual systems built for thirdgens but they can get realy pricey. Its just not practical, or worth the effort imo.

Just make sure you do your home work and find a free flowing muffler. With a good y-pipe like flowmaster.

Ive seen some good dual systems built for thirdgens but they can get realy pricey. Its just not practical, or worth the effort imo.



but there is one alturnitive.
a duel cat system is a much cheaper way to get the hp over the true duel.
i belive edlbrock makes a prebent header to y-pipe w/duel cats

Until you've actually experienced the before/after dual vs. single exhaust, maybe you shouldn't be commenting on cost and effort. I did mine for less than $300CAN including mufflers, x-pipe, and piping.

thats the problem with TGO, everybody on this board thinks they know everything about anything, and thats how misinformation gets passed around.

Just did my duals on the cheap ($150ca) its not the best for ground clearance but definately gets the job done and beats the hell out of any single pipe system...

OK so which one of you fools on here can post numbers that will prove a dual exhaust setup will make more power and torque than a properly sized single setup? Better yet, why don't we get guys like Darcom in here and let him tell us how much his single exhaust sucks on his blown 383? Or we can shuffle on over the some of the LS1 forums and see how crappy those LSX motors perform with a single exhaust. Ever seen any Harley Davidson motorcycles with 2 into 1 exhaust? As a matter of fact in the V-Twin world the single exhaust is proven time and again to make more power than true duals with a balance pipe. Come on guys lets use our heads here....

The LSX guys running duals with an X pipe are making significant gains. There is a post about a guy who just dynoed his car with single 3" and lost 5%, 5% is huge on a 500 horsepower car (30 horsepower!).

At least know what your talking about before throwing out the "fool" asumption.

Yah the fools are the ones who did not read my post where I said "properly sized single exhaust"

A 500 hp motor needs a larger than 3" single exhaust, since when were we talking about 500 hp motors? There is a reason Mufflex makes exhaust in 4" diameters.

No one here has proven that (let me say this again) a PROPERLY SIZED single exhaust costs power. All of you guys running true duals with them dragging the ground thinking you have the hot setup for power are barking up the wrong tree.

hmmm , me thinks a Mufflex 4" will walk your dual setup

how big is your duals ? 3"

I agree with you 1meanz a properly sixed single exaust mandrel bent system is all most mild engine builds need. unless your pushing 350hp+ then duals will be a waste of time. The thinking of bigger is always better is not usually the best way. Dual 3 inch is not even needed unless pushing 500+ hp.

I only went with 2.5" pipe, more than enough for the engine its behind...


And it probably would outflow a single 4", mostly due to the fact that it would be almost double the length of my setup...

Also cant beat the sound of true duals!!!

A 500 hp motor needs a larger than 3" single exhaust, since when were we talking about 500 hp motors? There is a reason Mufflex makes exhaust in 4" diameters.



its about backpressure. unless your motor needs to get to 7grand there is no need to put a duel exhaust.
and sound is a matter of what you like. i like the deeper tone of the single exhaust.it just what "you" like
let's just be friends

hey my hog 72 xlch ran a second quicker with drag pipes than that 2 into 1

Ok so how do you explain all the dyno graphs and all the testing on all the Evos and Twin Cams? I assume you know way more about HD exhaust than the slapnuts at Vance and Hines.....

it all about your part set up mainly valves and jeting. it takes a lot of pen and paper i run an old iron head i dont need a starter that what the biker limp is for
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straight through drag pipes is the way to go just make sure you home befoe dark(neighbors get freakin pissed)

As far as single vs. dual,I have ran both with my current 406,a single 4" with a dual outlet flowmaster,and dual 3 " with 40 series flo's,and there has never been more than a 10th of a sec. difference in the quarter,and it's gone both ways.(single faster at times,dual faster at times.I prefer the sound of the duals wit X pipe,so that's what's on it to stay.But for a daily driver and the ground clearence issues we all have to deal with,I would probabley stick to a good quality,custom built single setup with a Y pipe and all mandrel bends.
Just my opinion though,not here to enter any arguements.