Do this, get a reducer from a parts store so one end is closer to the size of the flange and the other end will fit you DP. Bake the cast iron in the over and then weld it. From what I've read, welding cast doesn't work majority of the time 'cause the heat is disapaited away from the weld. When you done allow it to gradually cool down. I'd think this method would work a million times better than flux-coring the shizz outta it.

 

MMM, I've never welded cast with flux core, But for extra filler, grab a 6013 Stick from an arc weld, hit it with a hammer to chip the slag off and use it like a tig stick with your flux core, The stick will act as an extra filler, taking the heat alittle bit from the mild steel and adding space.

 

jago thats not bad at all man. good work

 

so just to clarify, you have a wideband O2..but that is the POS you have as a downpipe?

Yikes.

 

sure, but there's a limit i think. You can have a sleeper looking car that goes fast doesn't mean it has to be that hacked up. There's hacked up..then there's this.

but, props to you for trying it and for posting pictures on the internet.

 

itll flow good enough to go fast, thats all we care about. Who the ---- is gonna start looking at his downpipe?

 

looks good to me