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So while searching e-Bay and other sites for a cheap 3" tailpipe, I found an interesting discovery.
Walker 54890 is a 3" replacement factory tailpipe for a 2011-2019 F150 all engine sizes. It has a 2 3/4 inlet that could be trimmed off. The hanger is in the exact same spot as the original on this generation. Mandrel bent.
If you shop around, you can find it pretty cheap. I paid just over $40, with tax, to my door. Advance auto has them on their site. Just use the generic 25% off coupon.
I would say yes. If it fits the 04-08, and dimensionally they haven't changed the frames, it should fit the 09-10. I added some dirty pics to the first post.
Not sure why you would even consider this. All you've done is slow down the exhaust gases in the pipe which become heavy as they cool. Now the engine has to work harder to push the heavier gases out. There are no gains here except a lighter wallet. And for those in the colder, humid areas, you now have a much larger condensation pipe making more water which is going to rot the pipe quicker.
Not sure why you would even consider this. All you've done is slow down the exhaust gases in the pipe which become heavy as they cool. Now the engine has to work harder to push the heavier gases out. There are no gains here except a lighter wallet. And for those in the colder, humid areas, you now have a much larger condensation pipe making more water which is going to rot the pipe quicker.
So a less restrictive larger pipe increases back pressure or work load now and makes more water? No way … on both counts.
Yeah, the larger pipe will slow exhaust velocity but the engine do not see increased back pressure as a result. The decreased velocity results from the lowered back pressure. The exhaust velocity depends entirely on how fast how much exhaust gas is being moved through a pipe in a given time period, slower is less work in a less restrictive environment.
Exhaust gasses cooling on cooler steel condenses vapor that is present in the exhaust gasses, it can't "make water" that wasn't already created in the combustion process and present in the exhaust. Even if the larger pipe stays cooler and condences more of the water already present, it is more metal present to spread any rust load.
Last edited by tbear853; Jan 17, 2020 at 09:15 PM.
There are several exhaust theories I have found. It really depends on what it's used for. And most of them won't show much difference between one another on a normal daily driver.
This particular tailpipe is from a factory Ford system where the exhaust increases in size the further back it goes. From what I can gather in that theory is this is done to combat restriction in flow as the exhaust cools. The further away from the combustion, the cooler the exhaust gas will be. It becomes dense and takes up more volume. The pipe is increased slightly to keep the flow the same.
On the note he is taking, is another valid theory. Usually this is in an extreme case where a very oversized pipe is used. Like a 3" exhaust on a Civic. When it's too large, the pulsations between the firing of the cylinders creates large pressure waves in the exhaust. This will cause over and under scavenging and can cause uneven flows cylinder to cylinder.
There are several, scientifically backed theories with dyno sheets, mpg readings, ect. As long as you don't go crazy, and stay within reason, it'll be fine.
My truck is a 2v 5.4 with raised compression, mild ported heads, and slightly larger cam lift and duration. It has full length headers, and 3" exhaust all the way back. The system is more suited to higher rpms, but it works great for me.
Maybe I should phrase this pipe as a cheap 3" tailpipe for those who are looking for an inexpensive way to finish their own custom assembled larger exhaust. Cheaper then Dynomax or the China-bay ones. And the hanger fits perfect into the rear factory mount. Though, this should fit a factory system, as well.
There are several exhaust theories I have found. It really depends on what it's used for. And most of them won't show much difference between one another on a normal daily driver.
This particular tailpipe is from a factory Ford system where the exhaust increases in size the further back it goes. From what I can gather in that theory is this is done to combat restriction in flow as the exhaust cools. The further away from the combustion, the cooler the exhaust gas will be. It becomes dense and takes up more volume. The pipe is increased slightly to keep the flow the same.
On the note he is taking, is another valid theory. Usually this is in an extreme case where a very oversized pipe is used. Like a 3" exhaust on a Civic. When it's too large, the pulsations between the firing of the cylinders creates large pressure waves in the exhaust. This will cause over and under scavenging and can cause uneven flows cylinder to cylinder.
There are several, scientifically backed theories with dyno sheets, mpg readings, ect. As long as you don't go crazy, and stay within reason, it'll be fine.
My truck is a 2v 5.4 with raised compression, mild ported heads, and slightly larger cam lift and duration. It has full length headers, and 3" exhaust all the way back. The system is more suited to higher rpms, but it works great for me.
Maybe I should phrase this pipe as a cheap 3" tailpipe for those who are looking for an inexpensive way to finish their own custom assembled larger exhaust. Cheaper then Dynomax or the China-bay ones. And the hanger fits perfect into the rear factory mount. Though, this should fit a factory system, as well.
I'm not an expert, just an enthusiast.
No dog in this fight, but the bolded section in your response is scientifically inaccurate. When a gas cools and become "more dense", it contracts in volume which would necessitate a smaller-diameter pipe to maintain velocity. More dense is akin to "more tightly packed", which means the molecules get closer together. It's the same concept for why NO2 systems require more fuel, because the decrease in air temps with NO2 mean that you can fit "more air" into the cylinder because the volume has been compressed. In general, I doubt there's much difference in observed performance between 2.5" to 3" pipe on our trucks at stock power levels, since neither one is maxed out. There may be some amount of lost torque due to the diameter increase to 3", but it's probably imperceptible with any measure outside of a dyno.
