Exhaust
 

Alright guys need your thoughts, I was at a metal fab company that does buissness with my company today and they were throwing out a ton of metal tubing. I grabbed some of it and brought it home. (can't stand to see fab stuff go to waste). Anyway, it looks exactly the same thickness as exhaust pipe. Two problems, first, it is 4.5 inches O.D. Second, it is galvinized I believe, so what is the differance between it and Aluminized? Let me know what you think, Waste of time or not?

if you weld galvinized steel it will omit toxic gasses. need well ventolated area and fans, or a re-breather for your hood

Going to rust a little faster than Aluminized I think in an exhaust application (fence posts like chain link are galvanized for comparison), but 4.5" is great diameter- if you have the ability to bend it, why not.
Personally I'd make up a couple at the same time to have spare parts when it rusts out.

cant bend that stuff, doesent work out it will crease, 4.5 exhaust would be cool tho just be carfull welding it the stuff if verry bad for you and can kill you man.

Cyanide gas! That's what you get when you weld galvanized! Even if you clamp it together it will probably still burn off over time on the hot exhaust. Don't do it, buy the right stuff!

Its a shame to let it go to waste, cause I got some pieces that are bent into 90 degree turns and everything! I can get a lot more of it too. But if I cant use it then there is no use getting more of it. Right now I got enough to do the entire truck I think.

4 inch aluminized is only 345 bucks off this site. installed in an hour and 4" is plenty sufficient for these engines. depends how much time and skill you have I guess, welding galv gasses not good. kit easy.....go with easy button

x2 I did my own to save money but its not worth it 345 is cheap when you figure you have to get manderal bent 4.5 pieces which are around 50-80 bucks a pop not cheap cant bend that pipe verry well

I guess I'll find some other use for the pipe, thought about using the straight pieces for stacks but they would problably rust unless I had them powdercoated or something. Thanks Guys.

i used the exact pipe you are talking about on my last truck. its honestly not that bad, just take breaks every so often if you decide to weld it up together. best way to do is be outside, thats what i did. just wear a face mask or something under the hood and you'll be fine if you take breaks. just be careful. either way you go is up to you. just throwin in my .02 because i had this kind of pipe before for exhaust. same story as you, they were just throwin it away

How did it turn out? Did it rust quickly?

Um, no, not exactly actually... You get Zinc Oxide and maybe (depending on the galvanized coating content) lead oxide- no cyanide.
Here, LMGTFY ...
http://www.sperkoengineering.com/htm...Galvanized.pdf

it worked well, didnt have any problems. i had the hx40 downpipe and just used an adapter to the 4.5 pipe. couldnt really tell a difference, just a little deeper sound than 4 in. i did not have any rust problems, it may also have to do with where i live but idk. maybe if you paint it, it would last longer since its protected

How did you make the bend at the rear end housing? Do you have stacks insted? If I made stacks then I could have a friend of mine powdercoat them.

i had it setup for stacks, but im sure if you ran it back to behind the tire, it could work with a few bends. i do know that exhaust pipe ran straight back actually sits a few inches above the axle with out any bends, like 4 inches above it at the least. so i think it would be easy to fab up a system that goes over the axle with or without any bends over the axle. just gotta make sure that you make good hangars so it doesnt sit too close to the axle. hope that helps