Originally posted by Puff01
Here’s probably a dumb question, but isn’t the water that gets into the exhaust from rain a concern? I guess it isn't, since I don't see caps on the big rig stacks, but it seems like it might be a problem if enough water gets in the pipe.
Puff01,
Good Question, there is several ways of dealing with this issue.
If you live in an area with light or no rain it is of little concern.
If it rained hard enough to accumulate in the exhaust (as in water backing up to the engine) your house would probably be floating away and you would take the canoe to work.
The problem with heavy Rain and Stacked Exhaust is that the water mixes with the soot and when you start it can rain down on your Lovely Wife who just spent 3 hrs getting ready to go to her inlaws.
As Gizmo suggested you can drill a coulple of small holes in the low point of the exhaust and that will let the water drain out. But keep in mind that if your "Father Inlaw" has one of those driveways that you want to take your shoes off to walk across this might also be a problem. .
Now for the GOOD NEWS:
1. For Straight stacks you can install Rain caps. I am still researching for the best looking and silent ones. And you can carry a set of stack caps. They slide over existing stacks and will keep the rain out while giving you the Bent tip or slash-cut /curved stack look. You can leave them on all the time or take them off when the rain stops.
2. For the

Mitered Cut Stacks I have just ordered 45 deg Flush Mount Rain Caps. Great looking Chrome Plated, internal clamping band / hinge and noise cushion. Will post pics asap.
3. For the Curved Stacks Style you can now get "Slash-Cut Curved Stacks" they do not require a rain cap.
Jacob, I agree 100%. There is a lot of flexing going on especially with 4x4 off road style use. There are many good ways of relieving stress on the exhaust componets, mounts and Turbo housings. and they usually allow a little water to drain.
Flexible Metal Hose: sizes 1 1/4" to 12" dia X 12" to 25' in length
Flexible Galvanized . 015 - . 017
Flexible Galvanized std . 018 - . 022
Flexible Galvanized HD . 023 - . 027
Flexible Stainless Steel (Type 302) . 018 - . 022
Flexible Polished Stainless Steel (type 302)
Flexible exhaust connections:
These are the same as the Flexible stainless but have carbon steel ends. Avail in plain or slotted and expanded ends. (Nice looking install for flex) 3" to 6" and 12" to 36" in 6" incriments
Bendable steel exhaust tubing (stainless . 020)
Continuous wall / Leak Tite!
Permanent and/or Intermittent Bends and designed for the temperatures and motions of Diesel Engines.
Ball joints and double ball joints
features avail: 10 deg angularity and 360 deg rotation
Double ball joints with slip joint adding Lateral movement
Lubricating ball joint (Do I hear some one saying TILT BED)
stainless bellows / expansion joint
many sizes and two ply, Master flex joints, bellows with liners and internal flex tubes
Expand-o-flex joints, Double flex joints
weld on or several different clamp styles.
and a New Adustable Elbow
Makes any Angle from 0 to 45 Deg. Designed to simplify repowering (engine swap) or Turbo charging mods. Five styles and 3" to 5". Adjust it to what you need for perfect alignment and tighten clamp. It is leak proof and can be welded if wanted. also chrome plate.
Sorry for the long post. Exhaust can be a real PAIN if not done properly. Noise, Rattles, Exhaust fumes, Broken hangers, cracked manifolds and turbo housings ETC... ... . There is what you need Avail to do a Professional, SAFE and trouble free Exhaust system.
Feel free to "E" or PM me and I will be happy to offer any help / information that I can.
Thanks Kurt