I am going to true dual my 2006 4.6 and wanting some ideas for cats??

Lets here your suggestions!!

And a little FYI I am going to be using Flowmaster Super 40 SI/DO's.....

 

FYI, if you're going to go with a SI/DO, then it's not a true dual.

I believe that Mangaflow makes some hi-flow cats.

- NCSU

 

Not to be a Smart A**, but if you look right after where I wrote SI/DO it has " 's" as in using 2 Super 40's.

And thanks for the suggestion.

 

Why would you want to run two SIDO's? Why not 2 SISO's like everyone else?

- NCSU

 

Hello Blake??? You going to keep us hanging?

- NCSU

 

Well then, at least be sure to post pics of your quad pipes!

- NCSU

 

FYI I dump all my exhaust!! Sorry if I didnt state that...

And who in their right mind would have quad pipes out the back?? Dont have to be a SMARTA**.....

And for going with the SI/DO....
SI/SO= 1 3" at the most outlet.....
SI/DO= 2 2.25" outlets= 4.5" total......

PLUS I already have one Super 40 SI/DO on my truck, so why buy 2 new mufflers when I can get away with one......

 

Damn you must have a built motor to need all that free flow.

Magnaflow is probably where you should look for those cats.

 

That's why I was asking.... We don't know you and we aren't mind readers.

I don't know who you've been talking to, but you seem to be a little confused. Nobody is going to be running 3" pipes on a true dual setup (I'll explain why below) regardless of whether they go with 2 SISOs or 2 SIDOs. 3" is simply WAY too big for a true dual setup. Now, if you're going to run a single SISO or SIDO, then a 3" pipe on the input side would work.

On that note, your "math" is just dead wrong. The 3 inch measurement of a 3" pipe refers to it's diameter not it's area (I assume you know the difference). Now, the area of a circle is A = pi(~3.14) * radius (half the diameter) * radius again, I'm sure you've heard of this equation, "Area equals pie are squared". Since the exhaust gasses are filling up the inside of the pipe, you need to be concerned with it's cross-sectional area, not it's diameter.

So the stock exhaust pipe at 2.5" diameter has an area of (3.14)(1.25")(1.25") = 4.9 square inches.

Now if you were going to go true dual with 3" pipes (like I think you were suggesting above) that would increase your area dramatically. The area here equals (3.14)(1.5")(1.5")(2 pipes) = 14.13 square inches. That's nearly triple the stock value, this is why you don't run true duals with 3" pipes.


If you use 2.25" pipe for true duals you get (3.14)(1.125")(1.125")(2 pipes) = 7.95 square inches. That's about 1.6 times the stock value.

Now if you notice in the above scenarios, the muffler type doesn't come into play at all.

The reason people use SIDO is to give the dual exhaust look without affecting the vehicle's stock exhaust values. That's to say, same gas velocities, pressures, etc. With only the 4.6L, you really don't NEED the extra area since you aren't a supercharged race truck and aren't making that kind of power. That said, it's much cheaper to go with a single SIDO muffler to achieve the same look as true dual (which you did).

I'll give you that one, it makes sense to reuse the part since I'm assuming it's only a year old or so. But if you're looking to stay on the cheap, why are you doing this at all? You're looking at dropping ~$100-$200 for each cat, add the other muffler, (have you thought about an X or H-pipe?) and the additional pipe work in the front plus labor you're probably talking about $500-$600 minimum.

Geeze, after typing that out it looks like a whole lot of money you want to burn and not really see any benefits. Do you have an X-Cal2 with Mike Troyer custom tunes? That would be cheaper and give you ALOT more bang for the buck.

Nah, he just doesn't know what he's talkin about!

- NCSU

 

Yeah I wasn't going with 3" pipes, I was going with 2.25".....

And about to labor part, my buddy is doing it so its just costing me parts and material....

And the whole reason I am even thinking about doing this is trying to make it louder, and yes I know I need a X or H pipe to balance it out....

So what are your suggestions about making my truck louder?? And yes I am getting either a Troyer or VMP tuner after I get my exhaust done so I can get it tuned for my AF1 and exhaust.....

Not sure, why ya'll flamed me so bad, if it was a dumb idea, just say so, you don't have to make me look stupid....

So what would you suggest to make it louder?? The SI/DO I have on there now is a 1 chamber.... Would cats make that big of a difference??

 

hi-flow cats will definatly increase your sound. 2.25" true duals sounds like a good size, no larger than 2.5" and your all good. two single in single out mufflers is definatly what you should use, dualed single in dual out definatly will not work right. This is your chance to upgrade to Super 44s though, those are the best Flowmaster has ever put out I love mine. and finish your exhaust off with 4" outlet tips of your choice.

 

What about getting two Dynomax mufflers? 2.5" tubing. I'm running this set-up with a H-Pipe and LOVE it. Not to mention Dynomax will refund your money if you don't like the sound.

 

Thump, how loud is this setup?? And I am guessing you are running Magnaflow cats since you recommend them??

 

It's pretty loud but it's a good sound. If you want LOUD than just straight pipe it and be prepared to lose performance. I had Flowmaster 40s before this set-up and it was a little quieter but not much and it was a lot slower!

I don't have the Magnaflow cats but know people that do and I've never seen anything but good things about them.

 

So what kinda cats are you running?? The Dynomax's helped out that much with performance, or what that a joke??