Cruising at 420 in formation

[Galangal]

Actually something I'd like to ask:

What about, lets say me and a buddy are chasing after another guy, we're 3k from him, too far to use CD.
My buddy's in cruise, the chasee is in cruise.

I form up on my buddy, so I'm going a good 420, then as I get close to him, I go into E kill, so the momentum keeps me going, and I end up overtaking my buddy, and getting into CD range of the person we're chasing?

Does that count as an illegal exploit?

Doesn't work.
If you want to engine kill, you have to return to free flight and as soon as you do, you slow down.