stack installation

[1994IDI]

alright, I've decided to go with the used stacks that a member here helped me find. I need to cut a hole in the bed. The truck is getting a rubber bed liner installed in the next couple days, so a torch is out of the question, and i don't have a hole saw. What's the best way to make the hole?
Dual 5" stacks with 5" piping in the bed, flex pipe reduces to 4" under the bed. 4" straight pipe to the new 3" downpipe to the new 3" elbow. Also need to find a way to reduce from 4" to 3" downpipe. preferably without ordering a reducer from the internet.
Any suggestions?

 

[ghunt]

I cut a square hole with a cutoff wheel in my die grinder (could also use an angle grinder).

And, unless there's a place near you that carries reducers that big, you're gonna have to order a 3x4 reducer from somewhere.

Rockauto carries one from Walker that's only $11.72. If you're ordering some other stuff you could just throw that in.

 

[tractorman86]

if you want to do it cheep and are good at welding holes shut just put the 4"(black) over the 3"(red), smack four points in the 4" so it touches the 3" and fill in the gray
here's my "diagram"

 

[Agnem]

Torch is definitely the best way. A jigsaw will work.

 

[1994IDI]

ghunt if you could find a part number for that reducer that would be great. I cant find it. thanks

 

[1dieselman]

Plasma cutter gets my vote.

 

[Cat_Rebel]

Angle grinder & a sawzall then have a bed liner sprayed over it.

 

[Diesel_brad]

I used jigsaw twice. works fine. Just remember to leave enough space at the front of the bed for the front cross member

 

[4x4TruckinGirl]

Search for a local Truckpro shop they should have reducers......

 

[69dieselfreak]

napa has the reducers thats where i bought mine
another vote on the plasma cutter

 

[93turbo_animal]

napa jegs summit all have adapters

 

[FordGuy100]

Napa is where we picked up my 3" to 4" adpator

 

[tractorman86]

i guess i am the only junkyard exh builder on here

 

[93turbo_animal]

by the time I go to a junk yard walk around if they let you find the part and get it its not worth it to me to waste my time

 

[Cat_Rebel]

Alright some of you will but I don't mind.
I am on a budget & made a 5" to 3.5" adapter.

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