As the original question was on a road/track car, I suppose the question is how much work are you prepared to put into the car to prep it for the track and them return it for road use??
I have a car which see's street and track time. One the street it has the flat floor (aluminum panels) on all of the time as the height difference is very small and it is a hassle to take on and off quickly.
To run on the track, we install (as well as various ducts for brakes etc) a carbon/kevlar front splitter (which is two levels and has diffusers for front wheels), lower the suspension to 60mm ride height from 100mm at the front (measured at the outside level of the splitter) via adjustable coilovers, install a 5 element rear diffuser with deep fences (still approx 60mm ride height so lower than the floor) and install new deeper side skirts that maintain 60mm road clearance along the length of the car with approx 7 degree rake. It takes probably well over 2 to 3 hours to install and set the suspension up either the day before or if needs be at the track in the morning which is less than ideal.
The difference these extras made on the track was huge and definitely worth the effort, but (and its a big but!!), you need to be prepared to switch the gear on and off the car. It's usefulness on the road, aside for a decent flat floor that doesn't reduce ride heights stupidly, is questionable at best and a painfully expensive exercise at worst.
I was lazy once and drove to get fuel, it ended up like a certain credit card advertisement:
Driving on the road with all you aero and r-compound tyres on the car - Fun but kind of embarrassing
Needing to dodge everything you can see and those you can't - Really annoying and tiring
Smashing the front splitter you spent 3 months designing, building and installing - Expensive and priceless for those around you watching.
I am still yet to live it down more than a year later!! The latest is Hulk smash splitter. I am just waiting impatiently for someone else to have their turn and do something stupid.
![Laughing :lol:](./images/smilies/icon_lol.gif)
Never approach a Bull from the front, a Horse from the back, or an Idiot from any direction