Through frame exhaust, how do I do it?

[INSIDIOUS '86]

So I need to run my 3" tailpipes through the frame right behind the front lead spring mounts. Can i just cut a hole or do i need to run a larger thick pipe through with it boxed?
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[INSIDIOUS '86]

TTT

Nobody holed a frame here?
Moderators maybe this would be better moved to the suspension section if you would be so kind
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[RPOZ11]

I sorat got that idea from how Corvettes route their exhaust piping back.

I figure you need to determine where your head pipe starts, in relationship to the distance to the muffler.

When you decide that, then you can start measuring where the area you need to modify lies.

I thought that round steel piping with ".xxx" wall thickness is somewhat necessary to provide strength and hole sizing.

[mcmlxix]

If its close to the spring hanger, I would definitely box the frame and weld in a 3.5" to 4" pipe the same thickness as the frame. Then pass the exhaust through the new oversized pipe...

[INSIDIOUS '86]

So if its boxed and the pipe is the same thickness as the frame its fine? Its going to be like a 3'1/4-1/2 hole and i beleive the frame is six inches tall at that section.

What would you guys do with brake lines? Also. Do i weld with vehicle weight in the wheels or any special supports?
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