I was doing some eBay shopping and came across this.

http://cgi.ebay.com/ebaymotors/ws/eB...DLVI%26ps%3D54

I was pretty surprised. It's not a true dual but I'd be happy. I'm just not sure about the 2.25 inch piping or ordering it from eBay. Thought?

 

I think for what it all comes with its not a bad deal but i would think if you had the 4.7 that you would be restricting the exhaust to much by going down. Jeeps I6 ran best on a 2.5 while stock was 2 1/4 and the 4.7 guys went from 2.5 to 3" systems.

 

Yeah, I could probably contact the guy and see if he could change to a 3" or at least a 2.5"... I hope

 

I have been to two shops for my exhaust to be done and they want about $130 to cut off the current muffler, replace it and bend the tubes for a dual out.

 

So should i just go ahead and just get the muffler by itself and have the shop change the tubes?

 

I would say most likely it would. I ordered a magnaflow from ebay single in dual out at 2.5". If you stuck with a cherrybomb they are pretty cheap in the first place. Then you can also decide how you would like to run the exhuast instead of having to do dual out the rear. I'm trying to find a shop that will split and exit on either side in front of the rear tires.

With the labor included into that ebay one unless done yourself would be over all more expensive then the route i went

 

putting my math knowledge to good use here...

Ok...

It's 2.5" in, dual 2.25" out...

Now, if we take the circumference of a single 3" pipe, and compare that to the circumference of (2) 2.25" pipes, they are going to be roughly the same...

I wouldn't change a DAMN thing with what I'm seeing here...

If you had (2) 3" pipes coming outta the muffler, that would be the equivalent of roughly, 5" or 5.5" piping, which is WAAAAAAAAAYYY overkill...

But hey, what do I know...

 

Wow that is way more math then i would like to think about there. I look at it in a different way then trying to put my math skills into it. When it comes in the 2.5 in then it has to fill the muffler with so much volume of air which is then pushed out both 2.5 pipes going out. It will exit out the muffler a lot faster with 2 outs but it is still being overall restrictive by the 2.5 going from the headers back.

 

I don't mean to say your wrong Frenchy I do understand your point and where your coming from but I wanted to express my opinion on the topic.

 

That is severely fuzzy math... what are you smoking boy? Exhausts are not based on circumference, its area and volume. those circumferences are going to be a good deal different as well, by lets say 4/5 of an inch atleast for 2.25 to 2.5. A 3 inch exhaust has 7.07 sq inches of area, one 2.25 inch exhaust pipe has 3.98 sq inches of area which you x by 2 and you get 7.96 sq inches of area, a 2.5 inch exhaust pipe has 4.91 sq inches of area, and a 5 inch exhaust pipe has roughly 19.65 sq inches of area. Now xs all those numbers by length and it'll give ya the exhaust volume. We all know stock is 2.5 inches. So with that baseline we know going slightly bigger is beneficial that's why most jump to the 3 inch for a single and 2.25 for the duals. Those two selections are 2-3 sq inches larger than stock. Not extreme but a good choice which keeps the exhaust from cooling too much causing a lag/non-siphoning effect during exiting from a reduced pressure to push it out as well as other factors which I wont get into. 5 inches would definitely be overkill, hell a blind squirrel finds a nut every once in awhile too ...