true dual
TECH Regular
Joined: Dec 2003
Posts: 434
Likes: 0
From: Denton, TX
Without cats and large mufflers, you will loose backpressure, which will cut some out of your torque on the bottom end. However, you gain what you lost on the bottom end, on the top end as horsepower. You also get rid of "rasp" which you get with a high flow y-pipe and no cats.
So the advantages would be sound, and horsepower. Disadvantages would be legality (if you don't have cats, or if you dump it at the axle), and loss of low end torque since you don't have as much backpressure.
So the advantages would be sound, and horsepower. Disadvantages would be legality (if you don't have cats, or if you dump it at the axle), and loss of low end torque since you don't have as much backpressure.
I picked up 24 rwhp at 5000-5500 rpms with duals, over a custom 3" open Y. Stock internal, with Mac headers. 2.5" system with a Dr. Gas X crossover.
So YES would be my answer.
Peak numbers may be similar, but mid-range power and torque should be greatly increased.
So YES would be my answer.
Peak numbers may be similar, but mid-range power and torque should be greatly increased. 
TECH Fanatic
Joined: Feb 2004
Posts: 1,938
Likes: 0
SOTP is waaaaaay better w/ duals. But you can go fast w/ either setup, like mentioned above. I got duals b/c I wanted my car to scream on the top end after my cam install.
And btw, any "loss" in torque (which is a misconception anyways) can be made up with steeper gears.
And btw, any "loss" in torque (which is a misconception anyways) can be made up with steeper gears.
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Originally Posted by WILWAXU
Most of the advantage is in weight.
Many of us are going fast with an ordinary y-pipe
Many of us are going fast with an ordinary y-pipe
I think with a stick car youd notice some benefit with duals cuz the engine sees a wider range of rpms.
Originally Posted by koolaid
Without cats and large mufflers, you will loose backpressure, which will cut some out of your torque on the bottom end. However, you gain what you lost on the bottom end, on the top end as horsepower.
Originally Posted by koolaid
Without cats and large mufflers, you will loose backpressure, which will cut some out of your torque on the bottom end. However, you gain what you lost on the bottom end, on the top end as horsepower. You also get rid of "rasp" which you get with a high flow y-pipe and no cats.
So the advantages would be sound, and horsepower. Disadvantages would be legality (if you don't have cats, or if you dump it at the axle), and loss of low end torque since you don't have as much backpressure.
So the advantages would be sound, and horsepower. Disadvantages would be legality (if you don't have cats, or if you dump it at the axle), and loss of low end torque since you don't have as much backpressure.
As for cheaper
Not necessarily... 
Launching!
Joined: Nov 2004
Posts: 289
Likes: 0
From: Flower Mound, TX
why do people actually want backpressure? you DO NOT WANT backpressure, you want better scavenging from the combustion chambers. what good is backpressure? that keep the burnt up hot air in the cylinders. why would anyone want that. now yes, if you put 2'' primaries on our 346, it wont like it. why? because the collectors cant do their job. the exhaust gas doesnt have enough velocity to pull the air out of the other ports.
Originally Posted by BottleRocket
why do people actually want backpressure? you DO NOT WANT backpressure, you want better scavenging from the combustion chambers. what good is backpressure? that keep the burnt up hot air in the cylinders. why would anyone want that. now yes, if you put 2'' primaries on our 346, it wont like it. why? because the collectors cant do their job. the exhaust gas doesnt have enough velocity to pull the air out of the other ports.
Last edited by MeentSS02; Jan 7, 2005 at 10:00 AM.
Originally Posted by MeentSS02
More backpressure makes the car much more responsive around town.
Scavenging is what people need to talk about....backpressure is just a crutch
You can decrease backpressure by A LOT and still increase hp and torque from idle up.......
If you run stock exhaust manifolds or shorty headers into a 4 inch exhaust or something along those lines backpressure will definately help, because you are loosing way to much exhaust velocity, which kills scavenging....
BACKPRESSURE sucks though....period....
Sorry for the rant......
Originally Posted by Mooobunnny
Only if your exhaust setup was improperly designed to begin with.....
Scavenging is what people need to talk about....backpressure is just a crutch
You can decrease backpressure by A LOT and still increase hp and torque from idle up.......
If you run stock exhaust manifolds or shorty headers into a 4 inch exhaust or something along those lines backpressure will definately help, because you are loosing way to much exhaust velocity, which kills scavenging....
BACKPRESSURE sucks though....period....
Sorry for the rant......
Scavenging is what people need to talk about....backpressure is just a crutch
You can decrease backpressure by A LOT and still increase hp and torque from idle up.......
If you run stock exhaust manifolds or shorty headers into a 4 inch exhaust or something along those lines backpressure will definately help, because you are loosing way to much exhaust velocity, which kills scavenging....
BACKPRESSURE sucks though....period....
Sorry for the rant......
Launching!
Joined: Nov 2004
Posts: 289
Likes: 0
From: Flower Mound, TX
Originally Posted by MeentSS02
Because a lot of us use these cars as daily drivers and spend most of our time cruising around in the 1-2k RPM range where the engine isn't making a lot of torque. More backpressure makes the car much more responsive around town.
no it doesnt. velocity is the key at any RPM range. just like turbos, you can get one that spools early and makes good power down low, but its not going to do it's best at 7000rpm. same with headers, you can have some that are meant for all out racing and make great power up top, or you can get some smaller headers that are better for daily driving? all that does is make the ideal flow velocity for those headers come lower in the revvs. backpressure is the enemy.