My 4" single stack is giving me some trouble. It is solid until the frame rail at which point I have a piece of flex to make the complex turn around the frame. From there I have a short piece of solid straight with the 36" turn-out bolted to the end. The whole assembly is only clamped together.

This set-up has given me trouble in the past too. Have any of you run all solid with no flex?

How about welded connections?

I am thinking of switching to a 5" turn-out as well so this would be the time, but another inch under the frame rail, it seems like it will really hang down there, unless I spread it out after the frame.

Any thoughts.....

Let's see some of your set-ups...

 

If I got your problem correct you are trying to go under the frame rail to connect the stack to the pipe. I believe you might have beter luck going up through the bed and then out to the stack. I think Wannadiesel has a couple of pics in his gallery on his single stack setup this is what I would do if I ran a single. You will want to run a short section of flex to compensate for movement between the bed exhaust and everything else. Got some pics in the gallery on my setup but it's not a single 4. If you need some of the underside let me know. Jethrro

 

Coming up through the inside of the frame would work but the hole is alreay on the outside from the existing set-up.

About a year ago someone was going to run a rectangler tube between the frame rail and bottom of the bed (round to rect. to round again). This would eliminate the loss of valuable cargo space. They had figured out the right size to minimize backpressure. Hopefully they will chime in. I would love to see and hear how that worked.

Anyone remember this...

 

Mine's all solid, but it comes up through the bed. Getting to the other side of the frame to save bed space looked too complicated when I was building the system...it does lessen the utility value of having an eight foot bed, but that's what trailers are for, right? I think there are some pics in my gallery.

 

Isn't there more than 4" between the bed and the frame rail up front? I thought that first crossmember on the bed was about 5" tall? Or do I need to put down the crack pipe?

 

If you have a body lift maybe...

I know mine does not have that much room. I am not real near my truck right now, what is the standard room between the frame and bed?

 

Mine is solid too. Ran out of room for flex pipe because I used wide radius elbows.

Alec- on club cab trucks there's a frame crossmember in the way. That's why mine comes up through the bed so far forward. I haven't spent enough time under a std. cab to know where the crossmembers are on those trucks.