Starts with to blokes in a subaru wrx go on a holiday to go surfing (I think).
They come to a bridge where the run in to a couple of girls in a xu1, the girls offer
Them to go to a party. The boys follow the girls trying to keep up but they end up
Smashing there car into a ditch.( that's where my mind goes blank for a bit) they than
Catch up with the girls at some house and as the go to do stuff with them these boys
Turn up (mind a bit blank again) in the end they work out the girls are dead.
I remember they had to do something before sun light. One of the blokes die by I think
From getting chased and he trips and starts rolling down a hill and lands on somethingbut
He and his friend don't relize. Also there's something about a grave and a person that was
Berried there and at the end the bloke has to get over the bridge before day brakes.

Ha ha, I love the fact you can remember the EXACT cars, but not the film name!

I've started looking in wikipedia, but the possibilities are HUGE!

Is it a new film or not? (possible year?)

I couldn't tell you mate if it new or old as soon as I hear the name ill know it. Ill think its in the 90s. Thanks mate for trying to help me

The movie you're looking for is 2003's "The Locals" from New Zealand. A plot summary at imdb.com reads: "Paul (Dwayne Cameron) convinces his best friend Grant (John Barker) to travel to go surfing in the weekend. They meet two girls, Lisa (Aidee Walker) and Kelly (Kate Elliot), and they invite Paul and Grant for a party. They take a short cut over an old blocked bridge and Paul loses control of the car and hits off-road. They decide to ask for help to the locals, and they find that they are in an evil place."