Features
Smeding S300
3.5" High flow downpipe
Lower EGT's
Includes all necessary parts for installation
 
Kit Includes: 
T4 Pedestal
Smeding S300 Turbo
3.5" downpipe that works with factory Exhaust or aftermarket
Oil feed line
Oil drain line
Coolant plug
Gaskets
Bolts/other Misc Hardware
 
Upgrade your Duramax with the Smeding Diesel S300 Turbo Kit for LLY/LBZ/LMM models (2004.5-2010). This kit offers a cost-effective alternative to the pricey VGT turbo options, which not only have a very poor exhaust flow but also create high drive pressure. Engineered for optimal performance, it provides superior power and efficiency, ensuring your vehicle runs smoother and stronger. Experience the difference with a turbo kit designed to meet the highest standards of performance and reliability.
 
FITS- 2004.5-2010 GMC/Chevrolet Duramax w/ 6.6L LLY/LBZ/LMM
 
Cast vs Billet:
When you go from cast to billet, you get a lighter wheel. A lighter wheel means there is less rotational mass on the shaft, therefore you have a faster spool up. Peak horsepower will stay the same but you will gain a little bit better driveability.
 
The SXE-R (competition or race series wheel) is similar in the fact that it is even lighter than the standard billet, but it also has other geometrical differences. The hub itself is smaller, so although you have the same outside to outside diameter, you have a wider blade which means you have more surface area on the blade to move more air. The blades are also arched to provide more surface area as well. The nut on the wheel is also integrated into the wheel, as opposed to using a steel nut on the rest of the wheels. All of these differences provide a faster spooling wheel that pushes more air.