2003-2007.5 Cummins S300SXE CUSTOM Direct Drop-In Turbo (SMED-0945)

Fits

All Smeding Diesel Parts are Built To Order in Texas and are special order which can take longer than normal for fulfillment. If you're in a rush, contact us and we can make special arrangements.

This Smeding Diesel S300 Custom is a drop-in replacement for the 2003 to 2007 Cummins. 

 Part Number: SMED-0945

• Exhaust Houseing: 12cm / 14cm
• Turbine Wheel: 65mm / 68mm / 73mm
• Compressor Wheel: 62-63mm / 64.5-66mm / 69 and 72mm

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.

• 12cm Vs 14cm

The 12cm housing will be faster spooling but will get hot after long wide-open throttle pulls due to the size. The 14cm housing will be a little slower spooling but will handle wide-open throttle situations better. The 12cm housing is only available on the 65mm and 68mm turbine wheels.

• 65mm Vs 68mm Vs 73mm

These numbers reference the size of the S300 turbine wheel (exhaust wheel), we offer 3 different sizes as you can see: 65mm 68mm and 73mm.

Bigger is not always better, it's best to choose the proper size wheel for your application! Bigger the turbine wheel, the more energy needed to move it.

The 65mm turbine wheel will be the fastest spooling but will not support much over 500 HP. The 68mm turbine wheel will be a good all-around size for anyone wanting 400-550 HP but will support up to about 600 HP and the 73mm will be a good set up for some one looking to drive the truck aggressively and is looking for the most out of the S300 frame turbos, this 73mm wheel will support 750-800 HP.  

The compressor wheel references the size of the wheel where the air comes in, this is the wheel that you see facing you in the pictures. Smeding offers a very large variety of wheel sizes to fit all different applications, the smallest S300 wheel is the 62mm wheel, and the largest S300 frame wheel is 72mm.

Along with choosing a turbine wheel, choosing the proper size compressor wheel is very important. 

The 62-63mm wheels like to be around 400-550 HP these wheels are kind of the catch off of compressor wheels because they perform great at 400-550 HP with minimal lag, this is a common place for most 5.9L cummins to end up because with just some tunes and a turbo you are easily 500 HP or more nice daily driver/ tow set up. 

The next size up is the 64.5-66mm wheels, these wheels usually require some extra supporting mods to really enjoy the power they are capable of. With a S364.5 or S366 you are around 500-650 HP and have a few supporting mods like fuel upgrades. These make good daily drivers but you start losing the ability to tow with them because the power comes in rather harsh and somewhat late in the RPM range. 

Then, 69 and 72mm, these are the largest wheels offered in the S300 frame. These turbos can be used on light street trucks and racers. The turbos are happy at 600-750 HP and enjoy wide-open throttle pulls!

• Please choose your Exhaust Housing, Turbine Wheel and Compressor Wheel.