I was surfin in the inter-web and noticed Packard performance is getting into the xpt game. They have a turbo upgrade kit. Stock the xpt did 120whp on there dyno at 11psi. There turbo upgrade at 4psi did 149whp.
This is from there Facebook page
They ran turbo yxz’s, stage 3 Mav’s, stage 3 xpt’s, z1 swap at 20psi, r1 swaps.. And never lost a race.
They currently are doing 210whp at 17psi, stock motor, stock clutch

I’m impressed.