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You could check to see if Hypertech/Superchips/Diablo/JET makes a programmer for your truck. This would yield you some performance (around 10-15 hp).
I wouldn't invest in an exhaust system. Many people think that a less restrictive exhaust will yield you more power. This is the downfall of many ricers. Backpressure provides torque, which is exactly what you are looking for (acceleration). Only larger displacement motors can benefit from more exhaust flow.
You could try a K&N FIPK (Fuel Injection Performance Kit). They are expensive (~$200-$300), but are effective.
-BD
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