Mods don't normally increase value of car??? Since with mods, engines, trannys, e.t.c. are more likely to end their lives faster, definitely with shit like nitrous.My wife doesn't like me putting money into my 1995 civic. She says that it is too old and that I should buy a new or newer one so that it is still worth something. I say why, the car is paid for and is in excellent condition. The mods I make will increase the value of the car.