you don't need a wastegate... let that sumbitch eat!
I've run as big a tune as I can on every 6.4 I've owned. I've never paid a lick of attention to EBP. I watched buddies beat the tar out of them on big tunes, and I'm not near as hard on them as they are.
I've got two of them in the driveway right now running 2.2-2.4us duration. I've been actively tuning both of them lately, so they've been getting plenty of WOT runs. My old service truck had 200k on it when I sold it. Same tunes on it. Stock fuel and turbos.
Oh, and untouched EGR on every one of them. I see exponentially more issues with EGR ******s than I do with actual EGR components! LOL water leaks, exhaust leaks, frozen EBP tubes, etc. I've never had a single EGR related problem.
And... I don't know if it holds true on 6.4's, but on the 6.7 Dodges, I saw a TON more blown head gaskets on trucks with EGR ******d vs. not. Does the EGR path act as a pressure buffer chamber to lessen EBP spikes?
Or are guys who "gotta rip all that stock junk off so I can have water leaks and crank case vapors puffing under muh daily driver" just harder on their trucks?
I tuned a buddy's 6.4 with just an absolute dirty nasty tune. He's hard on trucks and is balls to the wall with them. The truck was lifted on 37's with 3.55 gears, and it would hit 60psi boost on stock fuel and turbos. I'm sure EBP was 100+
I talked him into trading it in on a 6.7 once it hit about 180k miles because *I* was concerned that it was going to let go on him! LOL
But that's the kind of abuse I've seen these trucks take. Run whatever tune you want because there's no magical EBP limit that's going to prevent damage. If something's going to happen, it's going to happen IMO. Might as well enjoy the truck!