i want to custumize my car and swap the motor but the version i have download have just XFG XRG and f1...I want to have civic and b18 think like that and the vtech sound !! anybody can help me ??

It is not possible to swap engines or put new cars into LFS.

It is possible using the engine sound editor (press shift-A while in game) to make a car sound more like a VTEC engine but, as far as I'm aware, LFS does not model variable valve timing.

Oh and the FBM is a Formula BMW btw, not a Formula 1.