I ended up purchasing a 6266 gen 1 instead of a 6466 from someone used. My goal is 700whp on the same mustang dyno that I reached 508whp on with an s257sxe .82 t3. I knew a 6466 would do it, and possibly a 6266 gen 2, but not a 6266 gen 1. Has anyone ever reached close or above to 700whp within 5% give or take with a gen 1? My guess on absolute kill I will only reach mid 600s.

My build is as follows:
85.5mm 9-1 CR Arias pistons
Manley Tuff H beams
GSC Behive springs
Kelford 272/272 cams
Ported Head
Ported Stock evo 8 manifold
S90 74mm tb
Sheepey 850hp FMIC
6266 DBB Gen 1 .82 t3
Full race t3 turbo manifold

Buschur double pumper with twin 255s
ID2000ccs
AEM fuel rail
eBay FPR with genuine Aeromotive 13001 diaphragm
-6 to and from hardlines