Sorry had a busy day, got home after dinner and insta passed out on the couch, my girl thought I was cute and just left me sleep. I woke up now at 1:30 am awake, shes trying to get me to come to bed but Im awake Ive been sleeping all night & still got to go to work tomorrow.
She shoulda woke me up seriously.
For sound what we do is find the car that sounds the closest to what we want and take the sound from it, so its going to take some sniffing around to find the sound you like, the VGT cars are a great source for awesome nasty raspy sounds better than most cars in the game.
Power wise its all about tweaking the turbo code. Each turbo runs with additional codes that we call gauge, waste gate and whistle. In combination with the turbo code we can boost power considerably and run a supercharger at the same time or on its own. It takes a lot of trial ad error messing with the codes but I can usually get the hp inside a couple hp of any hp target I go after while maintaining a realistic power band.
While you are looking for the sound you want I can work on the performance side, what car and hp is all I need to know.

Ill be up for a bit but I got to get back to bet so I can get up in the mourning.