Competition The right way- STACKS

[RacinDuallie]

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Has anyone put their stacks in their bed without layin that divider across the front of the bed floor- by running the pipe underneath truck for the drivers side stack? Yes I know that means cuttin 2 holes in bed floor, but to me it just looks cleaner with just stacks & no divider in bed.....

 

[Oasis-3]

I have seen it done But it takes alot to get around the fuel tank on the driver's side.



Good Luck

Cliff

 

[pwknapp]

I ran mine over the fuel tank with a heat blanket. When changing out the flatbed to a convential bed I noticed the heat blanket stainless mesh outer screen had molded into the fuel tank a bit. I added a stove pipe between the heat sheild and tank and that seams to be doing great.

 

[smokejunkie]

member catoiler has a pic of his truck like this. Very clean install, probably the best looking install Ive seen on this site. Send him a pm for a pic

 

[catoiler]

Here ya go!



#ad

 

[Mark_Kendrick]

I did the same thing on by 2500 qc swb. If I had a long bed an ovalized 4" ( read this as squeezed a bit ) should fit. The SWB necessitated a 3" pipe over the fuel tank.



the truck had twins w/ a 5" downpipe straight back to a 5" straight muffler/resonator. out of the muffler turned 90* up into a pair of 4" 90*s ( handmade y-pipe) through a 4-3" transition, through a 3" 90*(4" radious) into the bed . the stacks themselves were 4" aluminized inside 5" chrome slash cuts.



I didn't like the 3" pipe but after doing the calculation the pair of 3" pipes flows more than a single 4" but a bit less than a 5" . the area of a 4" pipe = 12. 57 in^2, 5"= 19. 63 in^2, 2 x 3" = (7. 07) *2 = 14. 14 in^2.



The truck sounded great, was quiet in the cab and had no drone. I couldn't ask for more.



FWIW,

Mark

 

[Forrest Nearing]

I'm looking to do an under-bed crossover with a 6x3" rectangular box... it'll be a little tight on a 2nd gen, but looks like a mile of room on a 3rd gen.



Forrest

 

[catoiler]

The rectangular box won't go on a 3rd gen a little bend is required in it. Mark that is how mine is done put the flex in the vise and made it into an oval. worked like a charm!Overall it was not that bad a deal to do just time consuming to cut and weld the U bends to the right shape to clear. Buy the way those are 6" stacks with 4" U bends and 4" to 5" reducers to the stacks. The stacks are 6" reduced to 5" from the factory. If you are worred about clearance you could use 3" over the tank and it would work fine as mark said.

 

[Mark_Kendrick]

I didn't use any flex but it's not a bad idea. I bet it made things a lot easier.

 

[catoiler]

Yes it did!

 

[catoiler]

Go to my readers rigs and there are all the pics!

 

[catoiler]

You are gonna work your tail off trying to get 5" over the tank!You might want to remove the bed if you are going to not use flex it is a pain to get the pipes over the frame--I tried!If you do get the 5" over the tank you will want to use a heat shield as it will be to close.

 

[KYLE4]

Racin Duallie you will need some flex from intermediate pipe to bed setup otherwise shutting down truck will or torque will pull exhaust apart or put strain on turbo. Stack systems should have some give for there is not a bunch of rubber hangers holding system up. I have first hand expeirience in system coming apart.

 

[Mark_Kendrick]

I am gonna try this with a full 5" system -Turbo back.



Gonna try and make it 'with-out' flexxy-pipe. But we'll see... .

from the bed-catoiler- that looks cool- Like the oval mod at tank- I'll keep that in mind with the pipe. as far as heat is concerned I'll have the whole setup from turbo to the elbows 'Thermal Barrier Coated' and forget about it.

A pair of 4" pipes will flow more than your downpipe. 4" is cheaper, shorter radii and might actually fit



the problem you will have is the bends. the smallest 5" bend is a 5" radius. there's just not enough room.



I would use 3. 5" tubing bcause it will keep the velocity up and fit better(3. 5" raduis). That way you throw the smoke out of the stacks instead of just billowing out. You can 'tune' the stacks to drop the smoke right over the tailgate :-laf



2 3. 5" pipes flow almost exactly the same as a single 5" then run the 3. 5" inside the stacks so the stacks aren't hot to the touch. Other wise you have a 5" diam x 48" 800* branding iron in the truck bed.



just something to think about

 

[bluthndr]

Absolutely right about the temp - mine melt anything plastic that touches them after the truck has been running for 5 or more minutes...

 

[TRAMPLINEMAN]

If I am correct, I saw catoiler's stacks last year at Diesels in the Desert. He showed up late cause he just finished installing them. If this is the same truck, they are the best looking stacks I've ever seen!!

 

[catoiler]

Yep that was me!

 

[DieselNasty]

I am gonna try this with a full 5" system -Turbo back.



Gonna try and make it 'with-out' flexxy-pipe. But we'll see... .

from the bed-catoiler- that looks cool- Like the oval mod at tank- I'll keep that in mind with the pipe. as far as heat is concerned I'll have the whole setup from turbo to the elbows 'Thermal Barrier Coated' and forget about it.

I want to try to do the same thing.

 

[Mark_Kendrick]

For those of you also into the nostalgic street rods like me- I've found suppliers that sell oval tubing- and oval bends! Perfect for those tight situations! Also found what they call 'doughnuts'- round tube formed into tight rounds for tight turns.

So where'd ya find them? inquiring minds want to know

 

[Forrest Nearing]

Burn$ $tainle$$ $ells oval tubing