Join Date: Oct 2009
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nothing you can do, that's just how its gonna sound. Other than putting the cat back on that will stop the "Hissing" sound.
Mine isnt that bad. I was surprised when i installed my 4" diamondeye exhaust kit. My buddy's 07 with just a Silverline cat back and cat delete pipe is annoyingly loud as far as the turbo whistle noise.
Black 07 F250,4" turbo back MBRP, HID's., Bully Dog Programmer