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Please tell us more about your vehicle ( Year, Make, and Model ) and list all mods
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08 silverado 3500hd,only mods are downpipe,5" straight exhaust and some bulk tune.New turbos are hard to find in finland so i ordered that powermax from us,1800$ cheaper than stock in finland.Some say it needs to change n75 maps but also that it will work just fine without changing
Any time you increase boost/air intake you also need to adjust for fuel depending on your turbo. Programming helps that.

I would contact John Kennedy over at Kennedy Diesel: Kennedy Diesel
He can offer up some great advice for Duramax tuning
 
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