Hey guys I am in the process of gettin parts together for a turbo for my 7.3 idi would a hx35 or hx40 be better I would like it to spool fairly fast but not lose power at the end of my rpm range I am looking to push 15 psi and I am putting arp head studs. In

 

Hx40 I think it's too big to fit between the firewall and your motor. It has a huge compressor wheel. The hx35 will be small enough and trust me it won't leave you wanting. Hx35 is like the perfect turbo for these trucks. But thanks just my opinion. If I remember right my buddies hx35 didn't break until 42psi. He had his on a 24v cummins and when it broke he went to an Aruora 5000. But the hx35 is a good robust efficient turbo.

 

I'm also going to start building a custom turbo and im going to use a hx35 because if not then room will be a problem. Let me know what u set up.