Is 3" single better than 2.5" dual?
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Post Fiend
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From: Coutts Canada
Is 3" single better than 2.5" dual?
I just got a new exhaust installed on my pickup, i got a 3" inch pipe straight from the header into a 3" y-pipe that is located at the back of the cab, then for a muffler i got a dyno max superturbo, from there it goes over the axle and dumps behind the passenger rear tire with a 18" 3.5" tip. Now i had the option of going with a 2.5" dual system but i liked the 3" system better for the sake it was a lot cleaner underneath. Would the duals have been better?
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From: MA
No. The single 3" should provide the same, if not more power than the duals on a "normal" vehicles. Now, if you were running a 600hp 460, that would be a different story. The duals would be far superior to a single.
Rich
Rich
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From: Destin/Ft. Walton Beach,
It sounds like you have a straight 6. Am I right? If that is so, the 3" single may be a little big. If you have a small block v-8, the 3" would provide better torques at lower rpm's, or if you carry a load or tow a lot. If you mainly drive at higher rpm's, like with highway driving and such, then duals are the way to go. With a straight six, the only way duals would be a benefit, is if you had headers with two outlets, and then I would only run 2.25" at the largest. Running a single exhaust into a Y into duals doesn't do much for anything other then the sound.
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From: Destin/Ft. Walton Beach,
Correct Icicle. It's mainly about exhaust velocity. At lower rpm's, the single 3" sytem will maintain better velocity then with duals. There's also a little thermodynamics involved.
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Post Fiend
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From: Coutts Canada
Thanks everyone, from what has been said it seems that i choose the right exhaust for my pickup. I just wish it was a little louder.
By the way the motor in my pickup is a 350hp 351Windsor, it's built to run in the lower rpms, and if i would have put in some slower gears (its got 3:1's) it would be able to keep up with a camero SS.
By the way the motor in my pickup is a 350hp 351Windsor, it's built to run in the lower rpms, and if i would have put in some slower gears (its got 3:1's) it would be able to keep up with a camero SS.
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I am also interested in the sizing of the 302 single exhaust.
I have been to a few shops to price cat back systems and the most experienced guy said that 3" pipe was too big for the 5.0 and that I would lose low end torque. He said he has had people come back because they were unhappy with the 3" size and they changed to 2.5". The other shops seem to think that 3" is the way to go.
I measured my pipe dia's and found the ypipes from the manifolds to be 2.25", then it is almost 3" between the cats, and then it necks down to 2.25 after the 2nd cat and then 2.25 out from the muffler.
So I thought 3" out from the back of the 2nd cat would be best. Especially since there is a total of 4.5" in dia when you combine both pipes of the ypipe.
Now I'm a little concerned about choosing between 2.5 and 3.0". I like having torque for around town but I want h.p. when pulling my boat.
Will either of these sizes make a difference?
BTW: I plan on going with the FM 40 series muffler.
I have been to a few shops to price cat back systems and the most experienced guy said that 3" pipe was too big for the 5.0 and that I would lose low end torque. He said he has had people come back because they were unhappy with the 3" size and they changed to 2.5". The other shops seem to think that 3" is the way to go.
I measured my pipe dia's and found the ypipes from the manifolds to be 2.25", then it is almost 3" between the cats, and then it necks down to 2.25 after the 2nd cat and then 2.25 out from the muffler.
So I thought 3" out from the back of the 2nd cat would be best. Especially since there is a total of 4.5" in dia when you combine both pipes of the ypipe.
Now I'm a little concerned about choosing between 2.5 and 3.0". I like having torque for around town but I want h.p. when pulling my boat.
Will either of these sizes make a difference?
BTW: I plan on going with the FM 40 series muffler.
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From: Bel Air, MD
Originally Posted by mustange70
Thanks everyone, from what has been said it seems that i choose the right exhaust for my pickup. I just wish it was a little louder.
By the way the motor in my pickup is a 350hp 351Windsor, it's built to run in the lower rpms, and if i would have put in some slower gears (its got 3:1's) it would be able to keep up with a camero SS.
By the way the motor in my pickup is a 350hp 351Windsor, it's built to run in the lower rpms, and if i would have put in some slower gears (its got 3:1's) it would be able to keep up with a camero SS.
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From: Bel Air, MD
DanZ, you will be fine running a single 3" with your 302. My buddy has a six and runs a 3" single after the cats. He tows alot and said overall power has increased. It also sounds alot better. Get the mandrel bent pipes.
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