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- - Exhaust line and Back Pressure (https://www.ft86club.com/forums/showthread.php?t=141012)

Quote:

Originally Posted by DarkPira7e (Post 3342516)

Fairly certain Nameless makes headers that are 3" where it meets the overpipe. Doesn't really matter, since you can just get a 3" overpipe and it'll go from 2.5" at the header to 3" at the overpipe.

The Nameless is 3", but they are only building them if they get enough interest. They had discontinued them for a while.

From their site.

Quote:

OK WE ARE LISTENING. These are not currently in stock, but we have seen how many of you are searching for them, looking for used units, and downright begging us to pick up manufacturing them again. We will certainly consider it, and will consider a significant improvement to a 321 stainless alloy (Nickel, Chromium, Titanium alloy vs. the 304 which lacks Titanium). But we need enough people to get together and show interest in it before we move forward. So the first phase of this is to simply stop what you're doing right now and email us at research@namelessperformance.com. Get your name on the list. Let us know if you have any specific goals from the design. We will be doing a mild redesign of the system to bring the bending process in-house in order to offset the exorbitant cost of material in this updated alloy.

Quote:

Originally Posted by NoHaveMSG (Post 3342517)

The Nameless is 3", but they are only building them if they get enough interest. They had discontinued them for a while.

From their site.

Huh, makes sense. I understand why they don't want to make them though, I imagine there's not really a benefit

so what would the point of a 3" exhaust be if the headers are always going to be 2.5" max? i guess the cat might flow a little better?

Quote:

Originally Posted by Breadman (Post 3342534)

so what would the point of a 3" exhaust be if the headers are always going to be 2.5" max? i guess the cat might flow a little better?

Exhaust loses heat and velocity over distance. You'll get turbulence and lose exhaust scavenging if the exhaust is just a huge open pipe. Opening it where it starts losing velocity is not a bad idea though.

Quote:

Originally Posted by DarkPira7e (Post 3342537)

oh ok just wondering. i would have thought that it would be bad because making it wider would make it flow slower and cool down

PLM makes a 3" exit header. It was a copy if the nameless header. It's like $500 for iirc. But its EL. You could probably get a UEL of choice and have a shop fab up a 3" merge collector/exit for a full 3" system.

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Quote:

Originally Posted by Joveen (Post 3342578)

looked it up and that is real strange looking. i wonder how it works with a high boost pulley since that is the only real application for it