v6 vengence noticed a drop in power with twin throttles there just isn't any point running an intake diameter that big unless its running at full noise when you drive down the street to get milk, they make sense for burnout cars thats about it.
as for the engine, throwing a crow stage 3 into an otherwise stock engine won't get you close to 195kw, the VE sv6s put out 195 fwkw so closer to 170rwkw, in a car that's pushing nearly 2 tonnes makes for a car that is pretty slow out of the hole the older vns and vps are carrying close to 500kgs less if youve stripped all the silly **** out.
just a bit on buicks mine has
clive cams 48A (touch bigger than crow stage 3)
double valve springs
flat top pistons
stainless valves
ported and polished heads (heaps taken out)
40 thou off the heads and block
ACL race series bottom end
HD pushrods
port matched manifold (80 thou off so it lines up)
10:1 comp
makes 165rwkw
a mate of mine has one that made 195rwkw and had it de tuned to 180 because it was impossible to drive on the street absolute pig on fuel and a nightmare in traffic
mine still puts a smile on my face and thats all that matters