Industrial Injection S475 2nd Gen Turbo Kit 03-07 Dodge 5.9L Cummins

The factory turbo found on the 03-07 Cummins is capable of supporting sub-450 horsepower levels. Above this point, it is being oversped that will result in failure, as well as the fact it simply cannot supply enough air to support horsepower levels above this point. Further, the placement of the factory turbo is not positioned in an ideal position as its centered on cylinders four and five as opposed to three and four, resulting in the front cylinders running hotter than the rear. So, what's the fix? Easy, this turbo and installation kit from Industrial Injection to improve airflow and square the turbo on the engine! And now, lets talk about the turbo. Industrial Injection has done a LOT of research on turbo sizing. This particular S475 on a 5.9L will work best when used in conjunction with custom tuning and a larger set of injectors for power levels above 800 rear wheel horsepower to deliver maximum street and track performance. Turbo Options - The standard turbo kit will utilize a 1.10 A/R exhaust housing which is great for maximum boost levels and low drive pressure. However, if you're running minimal injector size (around 150), oversized tires, 3.42 or 3.73 gears, etc., you would be better suited to run a smaller A/R ratio, such as a 0.90, to actually increase drive pressure to assist in turbo spool. But if you're somewhere in the middle, say running 180 horsepower injectors, 35" tires, 3.73 gears, and daily drive the truck, you may be best suited for the 1.00 A/R housing. Alright, its time to stop messing around with smaller, bolt-on turbo upgrades. You want big power and you need the right turbo to get you there. No, we're not talking about 500 horsepower, or even 600, you want 800 plus ponies lighting up the pavement, and this turbo kit is what you need to get you there.