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.