Originally Posted by illinipo
Do you need to sand pack mild steel in order to bend it, or will it just bend like annealed 4140?
What thickness downpipe and manifold should you use? mig or tig weld?
Miy original DP was made out of pre-bent pieces, personally I like to use thick stock pipe.. I dont remember the thickness, but its pretty sturdy. My current one is also made from prebent pipe... but we did an angle cut style bend in it.. where you cut little pie shaped wedges then weld them together to make a bend.
My manifold is real thick... its actual PIPE instead of exhaust pipe.. I'll get a pic of it tomorrow to show you... you just wont believe how thick the walls are.
I cant see any difference in welding... TIG looks best but MIG is just as strong.