This is incorrect, your engine will affect your slipstream speed.
MACO engine has the fastest slipstream speed with driver coils maxed.
Borg engine next.
Omega next, and any other engine after that.
That is incorrect.
Borg Engine + Slipstream is just as fast as Efficient Mk IV engine + Slipstream. The MACO is sort of the exception since it increases driver coil, but that is effectively having more than 9 points in driver coil then.
Yes. Maxed Driver Coil + Borg Engine = ~ Warp 30. Maxed Driver Coil + MACO Engine = ~ Warp 28. the other numbers RAJ quoted are also correct.
I wasn't really *surprised* to see the drop in speed with the MACO engine vs. the Borg engine (because I read the tooltips ahead of time) but it does seem slightly odd given that one costs 5 EDC and the other costs 20 or 40.
Thankfully (for me, at least) the very nifty subspace bubble effect makes up for the speed. And honestly, the 2 Warp Factors is hardly noticeable.