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Discussion Starter #1
Hi
My 03 has very little turbo whine/noise it seems to have good power.

I just noticed how quiet it was after riding in my father in laws 05 duramax which has lots of turbo noise and it complete show room stock.

Is it normal for such lo noise or does my turbo have an issue?

Thanks
 

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Stupid Has The Balls
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You have a fixed geometry turbo so you will have no where near as much as a variable geometry such as your father-in-law's. If you put a metal intake, turbo horn, downpipe and straight pipe on the truck the turbo will be significantly louder and it will breath much easier as well as freeing up horsepower and possibly some mileage
 

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Slave to the Interwebs
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I would bet it is because his turbo is a VVT turbo and yours is not.
 

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My Dad's 04.5 LLY is louder than mine. It's normal. If you do what Ben says, it will get much louder.
 
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