What can i add or better yet what can i do to the engine to make it more responsive when i step on the gas!! Also anything i can do to give me more MPG!

I heard i can get an intake and some headers, or chip it?

whats more effective? or other things you can recommend.

money isnt the issue as long as i get the car to give me more HP and MPG

 

The best way to add hp? Sell your car and by the v6. Instant power.
There are literally hundreds of resources online and on this site about adding power.
You can do what ever you want to your car, but to notice any real gains a good HEADER(that's one, header) will run you $900+. A true cold air intake will add a few hp, but nothing you will notice anything other than the noise that will make you stomp the throttle more and get worse MPG.

If money is no option than time shouldn't be either, do some research.

 

I say sell that car and buy the v6

 

cold air intake+ remove cat