BlackRCSB

im debating on using either mild steel 16g or alumized 16g. and also what would be better, 2.25" or 2.5" ? im going to use 3" for my dp.

Atomic

iTrader: (42)

Stainless...mild will not like the heat.

shifty89

iTrader: (1)

Since when? Just curious as I've seen mild steel used for hot pipes in compound setups before and it worked fine.

1969x11

iTrader: (38)

I built my xover out of 16ga 2.5'' aluminized. Be sure your flex joint is rated for turbo use.

BlackRCSB

flex joint = flex pipe ? how do i know if its rated for turbo use

Atomic

iTrader: (42)

it has an inner liner

mild will work, but will crack and corrode fairly soon

o2camaross

iTrader: (2)

If youre building a log youll need something thick, like sch 10. I used 16ga mild for my hot pipes but I also use cast manifolds.

BlackRCSB

I actually plan on keeping the truck for a long time, therefore I'm going with a kb log

o2camaross

iTrader: (2)

I plan to keep mine for a while too lol. I went with mild steel Bc it was cheap and I could mig it. And it's held up just fine for 8k miles and over a year of driving. The next setup, I'll build stainless tubular manifolds.

kelsey_canard

iTrader: (5)

X2 on the mild steel. It works but won't last nearly as long. I would do mine in stainless if I had it to do over again.

I also did a 2.25 crossover. I was trying to save as much ground clearance as possible. Ended up being more of a pain then it was worth IMO. 2.25 parts aren't as common as 2.5 and kbracing logs are made to fit a 2.5 crossover iirc. I had to have kyle send me a log without a vband and I welded mine on. Just a hassle. I'd just go 2.5 because its more common.