Exhaust/Muffler help
#1
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Exhaust/Muffler help
I have a 2003 f150 with the 4.6 and a 5 speed manual transmission. The previous owner put on a K&N intake and a Duel exhaust system (not true dual, 1 in 2 out muffler) I want to upgrade the exhaust system with a true dual exhaust system with a x-pipe before the mufflers. I don't know what type of mufflers to run. I love hearing my exhaust nice and loud but don't want it to be obnoxious. Any suggestions?
#5
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Heartthrob
I have a heartthrob 4" cat back on my 5.0 with an aFe powerflow muffler. You might want to do a little research on flow characteristics of specific size pipe. Don't be foolish enough to think that two 2" pipes flow as well as a single 4". In fact, two 2" don't flow as well as a single 3", and you don't need to run an x pipe to equalize exhaust pulses. Not to mention the extra cost of pipe, and routing issues. Either way, Heartthrob makes a variety of quality systems, from 3", 4" to duals.
#6
I have a heartthrob 4" cat back on my 5.0 with an aFe powerflow muffler. You might want to do a little research on flow characteristics of specific size pipe. Don't be foolish enough to think that two 2" pipes flow as well as a single 4". In fact, two 2" don't flow as well as a single 3", and you don't need to run an x pipe to equalize exhaust pulses. Not to mention the extra cost of pipe, and routing issues. Either way, Heartthrob makes a variety of quality systems, from 3", 4" to duals.
It's not like your motor will explode without an X, but why would you give up healthier engine operation if you're doing things anyways? A crossover for duals is always a good idea. A 4" single system, even on the new 5.0 that makes decent power, is going to move the powerband up slightly and doesn't provide for optimal scavenging.
#7
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Scavenging in a single exhaust
It's not like your motor will explode without an X, but why would you give up healthier engine operation if you're doing things anyways? A crossover for duals is always a good idea. A 4" single system, even on the new 5.0 that makes decent power, is going to move the powerband up slightly and doesn't provide for optimal scavenging.
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#8
lol Somebody didn't read the link in my sig. Could have saved some typing if you read my exhaust write up. I'd agree in most cases duals aren't necessary (I'd argue in a 500hp supercharged 5.4L should have 3" duals but that's another topic), I guess I took it the wrong way about not having a cross.
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Being an engineer and working in the Automotive Industry; I have performed and read many tests on various sizes of tubing. In theory, a 2 1/4" true dual exhaust system would only flow 69 more cfm than a single 3" system.
2 1/4" straight tube flows 408 cfm x 2 = 816cfm
3" straight tube flows 747 cfm x 1 = 747cfm
The Hennessy velocipraptor is 800 hp twin turbo and runs a true 2 1/2" dual system from Magnaflow. How much power does your 5.4 "with mods" make?
2 1/4" straight tube flows 408 cfm x 2 = 816cfm
3" straight tube flows 747 cfm x 1 = 747cfm
The Hennessy velocipraptor is 800 hp twin turbo and runs a true 2 1/2" dual system from Magnaflow. How much power does your 5.4 "with mods" make?
#10
Being an engineer and working in the Automotive Industry; I have performed and read many tests on various sizes of tubing. In theory, a 2 1/4" true dual exhaust system would only flow 69 more cfm than a single 3" system.
2 1/4" straight tube flows 408 cfm x 2 = 816cfm
3" straight tube flows 747 cfm x 1 = 747cfm
2 1/4" straight tube flows 408 cfm x 2 = 816cfm
3" straight tube flows 747 cfm x 1 = 747cfm
FWIW I worked in an SAE testing facility for years.
The Hennessy velocipraptor is 800 hp twin turbo and runs a true 2 1/2" dual system from Magnaflow. How much power does your 5.4 "with mods" make?
I don't see how my daily driver truck gets involved in this, but I'll give my reasoning. The truck dynos at about 330hp at the crank. In the 04-08 3V 5.4L, Ford uses a 2.5" single system. When the stock power increased for the 3V 5.4L in 2009-10 to 320 hp, Ford increased the size of the stock exhaust to 2.75" to better balance how the exhaust scavenges across the power band. I use a single 3" system, as it gives decent low end scavenging and doesn't stack exhaust pulses at higher rpms.