I personally didn't have as good a luck with my DD on my first turbo project at 14 psi.......could have been learning curve.
I've seen four of the OVS piped sleds that work really well and no cracking. Can't speak of high boost radar run performance, but they are definitely made with thicker material, run really well, and cleaned up a lot of bottom end response issues.
That's a lot of miles on a stocker....hard to go wrong with another one, even if it only gave you 1/2 the mileage.
Good luck!