How well would IC Piping hold up if you welded it together for a downpipe?

 

depends on the thickness of the pipe and what metal it is... in some cases ic pipes are aluminum, in which case it will just melt...

 

do you have any suggestions on cheap piping that would hold up? something to use for fabricating a downpipe?

 

try pvc and let me know:P lol

jk plz dont

 

haha maybe if i want to turbo my kitchen sink. But seriously? Any suggestions onto fabricating a downpipe? What materials to use?

 

cheap mild steel maybe?

 

buy some mild steel non aluminized pipe, the thicker the better...

 

Mild steel mandrels are relatively cheap. One of this forum's sponsors is Columbia River Mandrel and they have anything you'd ever need. I buy all of my piping from them and it's always worked great. I just use 14 or 16 gauge mild steel mandrels and straight sections for downpipes. In fact, I just finished one yesterday made out of piping from them.

Where you don't want to skimp is on the flanges. The thicker the better. Sure you can get a 1/4" mild steel flange from China for ~$15, but if you spend another ~$15 you can get a 1/2" thick flange made of way better steal that will never warp on you or cause leaks and will allow you to weld the piping to it better. I know some of their stuff is gay, but I've been using Vibrant flanges lately and have found them to be 2nd to none in quality and fit. If you spend $75 you can buy all good quality piping and flanges and build a downpipe you'll never have to ---- with except if you change your set-up.

 

I use cardboard tube to mock stuff up before I actually cut and weld

 

Oh yeah make sure to buy two o2 bungs. One for upper narrowband sensor to keep ECU happy and another for wideband a bit downstream. At least if your car is like mine that's what you'll need. It's like $10 for 2.