Exhaust help
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Mountain Pass
Joined: Jun 2024
Posts: 114
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Exhaust help
I have a 97 f250 with the 5.8. After 27 years my exhaust is finally about to let go, as it's holding on by only one hanger now. I don't care for replacing it with OEM parts so I wanted help on what I should do for an exhaust.
My plan is to remove the cat, and everything else behind it. I'm going to buy a cat delete flange, put a flowmaster on, and just have it exit the passenger side Behind the door.
I've heard that the diameter of the exhaust is what affects the back pressure, is this correct? What diameter should my exhaust be? I have the "dual" style exhaust, where it becomes two 1.5" diameter pipes after the muffler. At the cat, the pipe is 2", so should my new exhaust be 2"?
also, what would be a good flowmaster muffler to use? I've heard the super 44 is a good choice but I'm not sure what to pick. I don't want it to be like open headers, but I would like some good noise.
My plan is to remove the cat, and everything else behind it. I'm going to buy a cat delete flange, put a flowmaster on, and just have it exit the passenger side Behind the door.
I've heard that the diameter of the exhaust is what affects the back pressure, is this correct? What diameter should my exhaust be? I have the "dual" style exhaust, where it becomes two 1.5" diameter pipes after the muffler. At the cat, the pipe is 2", so should my new exhaust be 2"?
also, what would be a good flowmaster muffler to use? I've heard the super 44 is a good choice but I'm not sure what to pick. I don't want it to be like open headers, but I would like some good noise.
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Mountain Pass
Joined: Jun 2024
Posts: 114
Likes: 4
it's two 1.5" and they merge into one. It's a rounded rectangle shape. Then the rectangle goes into the cat
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Mountain Pass
Joined: Jun 2024
Posts: 114
Likes: 4
Why? Wouldn't that affect the back pressure? The two pipes merge into one before they enter the cat and it looks like it's about a 2 inch diameter pipe
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Mountain Pass
Joined: Jun 2024
Posts: 114
Likes: 4
Yeah, that's right. I didn't know a good way to explain what style I had but I knew it wasn't true dual. So why does back pressure not matter on this style? And would exit velocity just mean a bigger exhaust that allows more exist fumes to escape?
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Fleet Mechanic
Joined: Nov 2022
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There's a bit of math to this, but in short: bigger ≠ better.
Bigger pipes will flow better at higher rpms, smaller pipes keep the velocity up at lower rpms, useful in a truck. Hotter gasses move faster. Bigger pipes radiate more heat, and let the exhaust expand more, both of which cool it down. 2.5" is probably a solid choice, do some research though.
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