in spool up compared to the stock manifolds, MS manifolds are well worth 1200 bucks, also you should consider getting cams as well. This is just an example of what a difference manifolds made on my car, obviously your turbo's behave completely differently then mine, I was making 15 psi by 5800 rpms on stock manifolds and stock cams; when I put in the ms manifolds and cams I was making 15 psi by 4200 rpms. I have the sp 700’s with .86 a/r.