I have no problem making custom parts. I have experience with turbocharging several vehicles, Mazda MX-6 Honda Civics, 350's 302's 305's RX-7's.
But i have no knowlege of the Mazda 2.6L 2602 cc displacement (mazda version of the engine not Mitsu.) engine. I am wondering if anybody has done this. What I would like to know is the following;
Compression ratio?
Which internals are weak?
which internals are strong?

What have you done?
Thank You

Some guys on my forum have looked into it and some may have done it.

Here is a page with some specs:
B2600i Specs (http://www.mazdatruckin.com/B2600i/B26Specs.html)

Stock compression should be good as long as you run low boost or an intercooler. I'm pretty sure the engine could handle 6-8 psi of boost on stock internals after that I don't really know. People have boosted the B2200 to 12 psi with good results so I'm guessing the B2600i should hold up fairly well. I would still try to beef the lower end a bit. If you have studs installed for the main caps and upgrade the rod bolts I think that would be the best insurance on stock parts.