All right little man I going to help you out but next time itz gonna cost ya. The K&n filter works buy getting more air into your engine faster. (think of it this way when you are running do you want to breath out of a one nose hole or two?) So after you get more air into the engine you want to get it out quicker. in come's headers and exhaust. Now like everyone said you don't want to go super big on your exhaust pipes. Ok the next thing is the cat's.
Yes you do need them unless your vechinle was made before 1979 I think. But you can get some free flow cat's and they work really good.
As for your lift someone is selling there 4 inch lift and it is one of the best one's you can get here is a link to it
click here . As for that cable thing I have heard nothing but bad things about them so I would avoid them. If you were to get the K&n, Headers, free flow cats and some good exhaust pipes then you will get a really good rumble that is not annoying as hell.
So what have we learned tonight
More air in=more power
Air out quicker=more power
itz the simple. Now just don't go thinking you are going to go get like 50 hp out of all this ok.
oh yeah get some pics as well.