I have a 1998 gmc sierra sl or short wide. it has the 4.3 v6. im triyng

[Tanner Dee]

to make it faster what can i do? it has a k&n air filter but i think thats it. I really would like to make the back in sit lower cause it sits higher then the front. i really need suggestions on how to make it faster and where i can find the parts for it. please help me out