I've never seen previous 5's or 7's go with hood vents....and if they did, it would look as silly.
The cars I know that have vents on the hood are the Benz SL....Jag XKR....maybe supercharged XF.
It may not be ricey in that it has stickers on it and has huge green spoilers.....but vents rarely make the car look better or tougher.
I personally like M Sport or M5 front bumper.....MSport rear valance (looks better than M5) with four pipe exhaust (Dinan, Eisenmenn)...black trunk lid spoiler. I've seen too many people on here put exhaust tips on.....that look added on.....they either are sticking out too far...or they have the wrong valance installed.
I might see how the M performance parts are....I think they have a front spoiler but it seemed a bit ricey, too.....I'd have to see it in person.