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I know its not 4" because the tube coming from the filter is 4" and there is a downsizer tube after were the CCV would go in, in a stock set up. I know this because I had to replace the down sizer pipe, but I dont want to pull it to measure.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.