[LMP]

Quite right Greenman.

There was another index aswell, I think the 'index of thermal efficiency'. It came in later than the Index of Performance.

The IP was awarded only every three years, but the ITE was an anual award.

It may interest you know that only one car ran to LMP2 specifications last year, being the NASAMAX Judd.

We are going back to GT1 and GT2 this year replacing GTS and GT

 

[LMP]

Correct, It did used to go by engine capacity. But now it slightly different, as Rosepip points out.

If you want to get clued up on modern regs then the offical le Mans website has six PDF documents regarding this years rules and specs.