Your best bet would be to go with a ATS Wastegated turbo kit. The ATS Aurora 2000 Wastegated Turbo System has been the premier turbo charger system chosen by professionals for over 15 years now. In 1994 Ford installed the ATS turbo kit on every Powerstroke engine produced from the factory. The ATS turbo kit uses a large bypass valve that is engineered to accommodate the engines exhaust gas volume allowing for maximum turbo boost with out the concern of over boosting the high compression engine. By using a large bypass valve and a large final exhaust expansion chamber you maintain very low exhaust back pressure. This low back pressure results in increased combustion efficiency. Combined with recommended fuel settings a 50% increase in rear wheel horsepower can be achieved. Recently the ATS turbo system has been redesigned to utilize the Aurora 2000 turbo charger that has become so popular in the demanding turbo Diesel market. There is no other turbo kit that delivers the rapid response and power that the Aurora 2000 offers. This kit gives your F250 or F350 the performance found on the newer model Power Stroke! In thus you will have more towing umph. The cheapest I've found so far is $1,990.00 on ebay. Now if you get this turbo and for 6.9 applications I recommend tweaking the fuel system by adding a 7.3 non turbos fuel injectors, fuel pump, and if your willing to go there a 7.3's cam and lifters. This will boost the power extremely and while your at it put on a boost pump. If its a 7.3 enjoy the power!
