Some good performance upgrades on 2008 GMC Sierra 4.3 V6?

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bigcountry1

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What are some good performance upgrades i can put on this truck? Looking for any suggestions. Any ideas?
 
K & N mass air flow filter, Flowmaster dual exhaust, Power programmer: All will improve horsepower. Lower the suspension w/ wider low profile tires with 20" or 22" aluminum rims will improve handling. Install a bed tonneau cover will reduce drag. I have a 2001 Sierra with a 4.8 and I did all this.
 
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