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Ok well i thought it was the turbo but now im kinda second guessing myself... does anybody know what makes some truck have a really high pitch whisle, not all of them do it but iv heard a couple... if a certin mod could you explain it to me? thanks.
 

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Try checking the intercooler boots and are if there is any holes or cuts on them
 

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to make the IHI whistle louder youll want to have a ported intake horn which i can get you. it makes a huge difference and it spools a few 100 RPM's faster. i also will have a compressor wheel upgrade availible soon after they ge tested alittle which will help spoolup, whistle, and flow more air and high PSI
 
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