You may want to leave a task like that to more experienced gamers! It use to be real easy but since DTR2 came out the designers have made it much more complex.Use to in DTR you could just open your game files ,go to engine and set HP to w/e you wanted! But like I said its a bit more complex now.You have to start by editing your block specs.Like increasing bore size,increasing or decreasing stroke.Even the material of the crank has to be edited like from stock cast to steel! Piston size will have to be increased and even the material there has to be edited.The lift and duration of the cam has to be edited also.Of course the timing will need to be advanced and the cfm's of your carb increased! Even the type of fuel will have to be edited to ensure you have plenty of octane! Theres just so many things that you have to edit from the original files that like I said you should really leave a task like that to more experienced gamers! If you go and edit the wrong sh*t you could blow your motor,which could cause you to throw a rod out the side of your monitor possibly causing you injury or worse yet killing a spectator or family pet! Not to mention all the oil everywhere thats probably gonna ruin your harddrive and everything on your desk! However if you really are determined to attempt these edits by yourself I could sell you a copy of the sold out very rare book..."Windows,DTR2 for Dummies!" ...you could learn a lot from a dummy ya know! But I really hate to part with it since its so hard to find anymore! I do know Billy Mays agent and I bet he would give you a great deal on not 1...but 2 copies for just one low price of just 19.95! If your interested just use the donation link @ the bottom of the page and dont forget the 3.95 shipping n handling!