[Racing4funn]

Is it a S300? Sometime I read S300 and factory turbos seem one in the same..

And what size are the factory turbos?

 

[Racing4funn]

so..no one knows

 

[wildcat]

Pretty sure it's the Holset HX35.

www.cummins.com/turbos - Holset HX35

 

[Twoforme2]

Actually for the 07 model I believe it is an HE351...according to Cummins
Dodge Ram Heavy Duty MY04.5

"The 5.9 litre Cummins 600 OHV Inline 6 cylinder is fitted with the Holset HE351 turbocharger which allows the engine to deliver more power and more torque than its MY03 predecessor despite having the same turbocharger envelope size. This is the first Holset turbocharger to utilise the compressor cover mounted 'Command Valve' wastegate technology. "