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Cat c15 BXS Iva Off is a pack of good bxs iva off files. I have been running the 650 in our trucks for years. Works great with the twins. Works fine with a single turbo also. Pulls around 40 boost with 80/1.45 non gated stage 2 turbo. Can take off the iva housings from under the valve cover and plug off the oil supply. Unplugged files