Effect of spoiler and splitter on classification

[jbarker52]

I am considering a wing and splitter on my Elise. (Mainly for track days) It would be similar to what comes stock on the Lotus Exige. Would that change my class which is currently SSM? Also, I assume using a racing slick like Yokohama ADVAN A005 S-Compound would put me out of SSM.

[01badz28]

SM let you run a certain square footage of wing - so you should be fine.

If the tires are still DOT approved, they are SSM legal. Otherwise, I think you end up in prepared or modified.

[MARKP]

With a non-DOT tire, you would probably end up in XP. I don't know what the aero device allowances are in XP but I know there are several cars that run some sort of aero.