preformance parts for 05 chevy silverado?

[Victor]

what would be a good preformance part that would give me better gas mileage and horsepower that i could put on my 05 4.3 liter v6 chevy silverado for under $375

[Stangman]

cold air intake. or decent cat-back exhaust.

[Daniel R]

Buy a Ford 150. Oops, for $375 all you can get is a Dodge Ram.