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  1. 01-04.5 LB7 Duramax Powertrain
    New here and first time duramax owner. Ok I have a 03 LB7 Cclb and was wondering can the smog technician tell a difference in his test with boost increase valve installed? And a plug n play afe scorcher tuner still hooked up but left in stock mode? Or is removing both my only option? Thanks in...
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