DC2 with InlinePro man.

Looking at making a DP and with a worst case scenario, how many mandrel bends would be required?

I'm thinking a couple of 3" U bends with 6" legs and a few feet of straight?

For the dumptube, I was going to route it back into the DP , but is a slip joint mandatory?

 

I'd re-enter the dumptube back into the downpipe at an angle of 45 degrees or less in the straight section or at least 12-16" down from the turbo outlet. Also to keep from cracking, put a small flex section in the dumptube, something like 1.5" ID stuff or whatever diameter your wastegate uses.

Those bends should be fine to complete a DP.

 

Honestly, I've done a bunch of downpipes with just a could U bends. The straight wasn't needed. Add in a flex pipe as soon as you get past the oil pan and you're good to go.
I agree with Andy R on the dump tube. Use a flex, keep an angle of 45 or less (do as little angle as possible) and you'll be happy.

 

Located a 1.75" flex coupling, thanks.


One other thing, is there any significant difference between using 304 and 420 stainless? I don't live up north and am wondering if it's worth the extra money for the 304.