lswhat?

i have a 1997 mustang cobra and i have been trying to think of a bunch of stuff i could buy to get some good power and i have heard about the diablo programmers and the sct programmers and i was wondering it they are worth the money, will they give me much power and make the car run a lot stronger, because i keep hearing all this stuff about programmers about how they give you all this power and make it run stronger, is this true or should i not just waste my money.