The absolute simplest way to make power is to bolt on a Doug Thorley Headers 50-state legal exhaust system.
Precise CNC mandrel bends, heavy duty 16-gauge aluminized tubing, and factory style hangers spell "quality". Capped with highly polished chrome tips, your vehicle won't just perform and sound great, it will turn heads, too
http://www.youtube.com/watch?v=9tEKRBT-tUQ&feature=player_embedded