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I went and talk to my local exhaust shop about 5inch stacks on my 98. He said he has done many like this. This is the way he told me, First get a piece of plate metal, something like 6x10x 1/4thick or so, then cut a 3inch hole in the center, then weld the stack to the plate, then on the other side weld a 3inch short piece of exhaust pipe. then cut the holes in bed and bolt the stacks the bed. now under the truck, I'm going to running 4-inch down pipe and 4-inch back to the bed. then he has a y-pipe that the 4inch goes into and two 3inch comes out. then run each 3-inch to each stack and throw some flex pipe inbetween somewhere for flex. He said by useing 3-inch it will clear the fuel tank. I thought i was a bad idea going from 4 to 3, but he said i'm going from 4 to two 3's, witch is actually like going to 6inch. He said all the one's he's done sound GREAT, What do you guys think, it would look pretty clean inside the bed??
 

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to do my buddys in his 2003 ram we are just gonna run 4 or 5 inch flex pipe from the charger to the crossbox in the bed then out 2 6" inch stacks level with the top of the cab.
 

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you don't want all that heat by the fuel tank it gets hot. i built a 5" square box in my bed with a 4" pipe welded to it going through the bed floor a 4" 90 under the truck and flex run to the down pipe. On top of the box is dual 5" OD pipe welded to the box and 5" ID stacks slipped over the pipe no clamps needed they are tight. i made my box from 1/8 stainless. When you do stacks make sure nothing gets near them that will melt or burn whatever touches them. i can email pics if you want.
 

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On 2005-11-28 12:17, SmokenRam! wrote:
I went and talk to my local exhaust shop about 5inch stacks on my 98. He said he has done many like this. This is the way he told me, First get a piece of plate metal, something like 6x10x 1/4thick or so, then cut a 3inch hole in the center, then weld the stack to the plate, then on the other side weld a 3inch short piece of exhaust pipe. then cut the holes in bed and bolt the stacks the bed. now under the truck, I'm going to running 4-inch down pipe and 4-inch back to the bed. then he has a y-pipe that the 4inch goes into and two 3inch comes out. then run each 3-inch to each stack and throw some flex pipe inbetween somewhere for flex. He said by useing 3-inch it will clear the fuel tank. I thought i was a bad idea going from 4 to 3, but he said i'm going from 4 to two 3's, witch is actually like going to 6inch. He said all the one's he's done sound GREAT, What do you guys think, it would look pretty clean inside the bed??

You are still loosing the bed space so just do it all in the bed just like we all have and cover it up with some nice high polish diamond plate.
 

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You are still loosing the bed space so just do it all in the bed just like we all have and cover it up with some nice high polish diamond plate.

Yeah thats the way i'm going to do it, i don't like having all that junk under it, plus i don't like it being so close to fuel tank. How hot do the stacks get?? I have two big CUMMINS stickers in the back window, are they going to melt off??
 

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On 2005-11-28 12:17, SmokenRam! wrote:
he said i'm going from 4 to two 3's, witch is actually like going to 6inch.

Um no, two 3 inch pipes is not equal to a 6 inch if i remember it is right around the same as 4 inch
 

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can some of yall post some pics of your exhaust with stacks from bottom side of the bed and from inside of it too. So I can see how yall did it.
Thank you
 

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On 2005-12-01 17:46, latest project wrote:

Um no, two 3 inch pipes is not equal to a 6 inch if i remember it is right around the same as 4 inch

4.24 be exact. whoever said that never passed math.
 

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my stacks have not melted my stickers on the windows... BUT, they do get VERY hot, the cross box gets hot enough EASILY to melt plastic.
 

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I had mine melt a tacklebox on the way to fish. That is when I decided to cover em up with aluminum diamondplate. Besides, what are you gonna haul that is gonna take up that extra space inside the bed. I put the diamond plate on and left about 3/4 of an inch all the way around it and now it serves as a butt warmer. It never gets hot enough to burn you now but before it did. I got the boys up at work to help me break it so it looks nice. If you try it under the bed, may God help you, I tryed and the easiest way is in the bed. You can fit it under there but you can't see to weld anything and it is really tight.
 
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