Chip tuning GMC Topkick 

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  Chip tuning GMC Topkick 6.6 Duramax 300 hp

  Chip tuning GMC Topkick 6.6 Duramax 300 hp. The only one with with digital system dual core microprocessor and programmed with 10 different maps.
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  Chip tuning GMC Topkick 6.6 Duramax 330 hp

  Chip tuning GMC Topkick 6.6 Duramax 330 hp. The only one with with digital system dual core microprocessor and programmed with 10 different maps.
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  Chip tuning GMC Topkick 7.8 Duramax 200 hp

  Chip tuning GMC Topkick 7.8 Duramax 200 hp. The only one with with digital system dual core microprocessor and programmed with 10 different maps.
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  Chip tuning GMC Topkick 7.8 Duramax 215 hp

  Chip tuning GMC Topkick 7.8 Duramax 215 hp. The only one with with digital system dual core microprocessor and programmed with 10 different maps.
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  Chip tuning GMC Topkick 7.8 Duramax 250 hp

  Chip tuning GMC Topkick 7.8 Duramax 250 hp. The only one with with digital system dual core microprocessor and programmed with 10 different maps.
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  Chip tuning GMC Topkick 7.8 Duramax 275 hp

  Chip tuning GMC Topkick 7.8 Duramax 275 hp. The only one with with digital system dual core microprocessor and programmed with 10 different maps.
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  Chip tuning GMC Topkick 7.8 Duramax 300 hp

  Chip tuning GMC Topkick 7.8 Duramax 300 hp. The only one with with digital system dual core microprocessor and programmed with 10 different maps.