At PERFORMANCE UNLIMITED, we are constantly tuning the 24 valve Cummins and the Ford Powerstroke. Our Goal is higher horsepower, lower exhaust temperatures, and safer boost limits. Our specialty is new model diesels. With computer controlled diesels, horsepower is only minutes away and can then be taken back to stock in even less time. For those people that want to go a step further, you can add even more horsepower with oversized turbo housing and massive four and five inch exhaust systems.