Flex pipe needed for stacks?

BgBlDodge

BgBlDodge

Hates hippies
Joined
May 7, 2007
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Is it needed under the bed or not? If I don't have to buy it I'd prefer not to but if it's needed I will. I plan on welding everything together that way nothing can lean to one side or the other LOL. I'm doing black 6" miter cuts flush with the cab with a 6"x6" crossover tube down to my muffler under the bed. It should be done hopefully by next weekend. Buying the piping tomorrow.
 
I have one with flex and one without. Only reason for it is when the opposite ends of the truck are going different ways or flexing. I know it would probably be better in the long run to use flex but my other truck that doesn't have it hasn't given me any problems.
 
I made mine ridged the first time, but it kept twisting a pipe out from under a clamp from the movement of the engine.
 
Tyler.......YES, USE SOME FLEX PIPE. Like previously stated, if the clamp is on hard enough, the next thing to flex is your turbo, or manifold. I too have seen several without, and no problems. But my opinion is yes.
 
I would think that after time the exhaust would give somewhere. Crack around a weld or something from when the frame of the truck flexes when driving on uneven surfaces. I like having my exhaust welded up tight too, but I dont know if there is any getting around this.

I forgot what kind of metal the flexpipe is made of but maybe you could weld the flexpipe to the exhaust pipe?
 
Yes definitely! If not, at the very least you will end up with some joint issues...

Im not sure if you have noticed before, but watch out the back window while you stomp the go-pedal and watch how much your truck flexes!

Not to mention if your doing any 4wheelin...
 
man, i think you need to run flex from the back of the turbo all the way to the bottom of the bed, that way you wont need to worry bout any welds! thats what one kid in fredericksburg did! LMAO!! :bang
 
I would it will absorb some of the vibration, so the cab don't vibrate!
 
Flex, and get some of those clamps that are swaged already (cant think of the name - but they will seal great.

exhaust%20clamp.jpg
 
Hurley said:
Flex, and get some of those clamps that are swaged already (cant think of the name - but they will seal great.

exhaust%20clamp.jpg
Click to expand...

yes, def get flex, and use those clamps^^^^^^ ill give u one good reason for flex also. i was detailing my truck in my garage, door open. well, i only have s 7 foot door and she just squeaks under if the door is locked up. In a hurry to be somewhere i forgot i hadnt locked the door up. I went motoring backwards only to nail the door with my stack, door fell on my truck :bang ...low and behold the stacks moved bc i had flex underneath (it stretched) not a nick on them....my garage door....ehhhhhhh lol

just saying it can save u a sh$%pile of money when u dont even realize! post some pics when your done!
 
YES use flex. Everything that has been mentioned above is reason to. Even the big class 7 and 8 trucks use flex somewhere in their exhaust systems. If you have a torquey engine or if you have rough roads, or off road at all, you'll be thankful you have it. As for the clamps pictured above, any pre-formed clamp like that for flex to hard pipe is ideal to use, and is why we include those style of clamps in our kits. I would recomend using at least 12" of flex in your set up, no longer than 18". Oh, and make sure it's stainless flex, and not galvinized. Stainless flex is more flexiable than the galvinized is.
 
Got a 12" piece of flex and those clamps. Now I gotta wait in line at the DMV to get my licensce renewed before I can go home and play with them.
 
My black stacks are flush with the cab, and while they look better imo, they SUCK!!!! The air over the cab carries the smoke downward and puts it right in the windshield of the car behind you. I'll never have another set like them. Just something to think about, if you care.
 
Thankfully my truck runs clean around town and I don't go around smoking people out so I'm not to worried about it.
 
I'm running a 5" hushpower on it to help knock the noise down. I had dual 5" straight pipe stacks for a couple of years and those were loud. I ain't making that mistake again. That's also why I went with a square tubing crossover pipe instead of regular pipe. I'm told the square/rectangular pipe acts as a resonator and helps kill some drone. Between the muffler and that it shouldn't be to bad inside. I hope. My girl keeps telling me to put them a couple of inches above the cab to help for the noise but that's not gonna look good.
 
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