Adding power to my 1996 Buick Regal 3.8

A few months ago I was given a Buick Regal '96 with a 3.8L. I have been trying to look for ad ons for the car to increase HP but havent had much luck. So far I have but in a K&N filter and tried out this thing called a tornado.

If anyone has any ideas on how I could increase my HP please get back to me, thanks.

OKay, the torando doesnt really work.
I've tried it, and have seen no effect.
High flow cat, like 65 bucks.
and delete the u-bend after the cat? (i stole that from another forum on this site).

Bill

thanks man