Upgrades and Classes and leagues query..

Can anyone tell me some things about when you are modifying your car…

First question is, how you can know in advance (before purchasing the part) if it will move you into a higher class , and if so how to avoid doing this…

Also, If you then do fit the parts, whether the car will still be eligible for the league you are currently racing in. I have often altered my car mid ‘season’ then gone back to then find out I am not eligible for the league i was currently racing in!!

How can you find out the eligibility criteria for each league. ? Is the only eligibility for the league is that the car is a ‘modern sports’ or must it also fall into a certain tuning category A,B,C or D class?

I never got to understand this area too clearly…

When you hover over the part BEFORE buying it it shows you the changes to your class (PI), power, weight and the like.

Some leagues require a certain PI - usually shown on the league tile.