I thought I saw on Magnaflows website that the round mufflers are aluminized. When I put the mouse over the link to go to the round mufflers it said aluminized anyway. Is that your truck? If so what is your complete setup? I think I remember seeing a thread about you doing headers before.

I've been searching but haven't found a real definitive answer on what the best size pipe to run is for a true dual setup. derrick said not to and I saw him state that in a few different threads. But then I saw others say thats the way to go for optimal flow. I'm confused.

 

Actually , derricks a smart cookie and thinking straight. I don't usually come around the exhaust forum because most care less about performance and just want it loud .. Stupid kid stuff

Not that there's anything wrong with that - just not into it. - True Dual exhaust - Bad move overall . Unless your constantly running WFO, you don't get enough out of it. A stock motor doesn't need all that flow - can't really use anywhere but up high and how often do you drive around @ 4000 rpms ?

If you just want an annoying noise maker - go for it. If want to keep your performance and like dual setup's - Go w/a single in /dual out.

Search "best exhaust set up" and use "quotes" when you search, you better your chances @ getting the info your after.


Magnaflows vary by type - Mines stainless w/aluminum end caps.



My Exhaust sytem is in illustrations here-

https://www.f150online.com/galleries/admin/usermenu.cfm

Exhaust build/before and after runs/ tests, Long Tubes - online here -

http://picasaweb.google.com/jbrew393


BTW- If I remember right - Troyer has the perfect set up made just for your truck..

 

That's essentially what I'm after. I wouldn't even bother doing it if it wasn't for the performance. Yeah, I'd like something that's not necessarily loud, but definitely noticeable, but I don't want to sacrifice power. It kind of defeats the purpose I'm after. After searching through Troyer's site I found the kit you are talking about. After reading the description, I've decided that's what I'm going to take. Mostly in part to derrick and jbrew and ofcourse Troyer. And I didn't mean to doubt what you were saying derrick. It's just hard to know what's the best route to go when you have so many people saying so many different things. I really just wanted a confirmation on the single setup being the best. And actually I really appreciate the honesty since it seems everyone just says run duals. One last thing though, does the rest of the exhaust sound like a good plan. Current plan now is OBX long tubes into high flow Magnaflow cats to a 2.5" DI/3"SO magnaflow y-pipe with the 15681 Magnaflow cat back. It's going to take a little longer now that I have to buy a $500 cat back system. Maybe I'll just temporarily run the Gibson 3" I have sitting in the basement until I get the proper funds to get the Magnaflow.

 

Well , it's up to you, but you can always just do the headers and cats (From the Y forward) and connect your current mid-pipe /muffler / tailpipe for now.

Or just get the muffler and add that in - The mandrel bends in a cat-back system isn't really going to make a whole lot of difference for a stock application. IF 2.5 pipe is recommended in the system from the Y back - @ Troyer's Site.

I can't recall if they used a 3" cat back or a 2.5" for a stock motor set up. ?? I'm pretty sure that system was Dyno tested without headers.

So you may just want to stick with 2.5 pipe regardless.

 

Well, the system Troyer sells for the 01-02 Expedition is a 3" system from the cat back. I can only imagine a 3" system would be better suited than the 2.5" for the long tubes and hi flows. I also like the idea of the entire system being stainless.

I'm probably going to give Troyer a call later today to order the efans, pulleys and the xcal w/custom tunes so if I remember I'll ask then.

 

Thanks guys! ESF, you won't be sorry with the single. I really didn't like the duals, just for the same reason you wouldn't. For performance, you get a lot of flow, but it's not in the useable RPM range where you usually drive. Yeah, it's great if your at 6K RPM's but how often are you really there? I liked the everyday useable torque that the single seemed to give and it also flows well enought to perform great also. It was the best of both worlds.
Not to mention, that outrageously loud stuff gets really old fast. I had a single on my 7.3 diesel and it worked great on it, and I like the performance of the single on the 5.4. Same as with my motorcycle, the greatest flow rate isn't always in a RPM range where you can use it. I found out real fast with them, you can have a free flowing exhaust but unless your wide open at the top of the RPM range, it's really not all that useable, especially on the street.

 

By the way, do a few quick searches, there are a few reference tables that give a guideline of what size exhaust tube to use for size displacement and HP rating. I was considering mine with the supercharger, and 3" single was right at the upper limit, so that also helped influence my choice. Dual 2.5"s, would really handle a lot more than anything any of us need, so I went with the smaller single. Didn't want the loud noise, just nice torque and overall flow too, not just up top.