I have seen a few aftermarket exhaust options that appear to be available. Afe and magnaflow so far... Has anyone heard these exhaust systems on the truck? I really don't care for anymore "loud" and definitely don't want raspy. Mainly focused on more turbo whistle like my diesels used to have. I'm thinking downpipes will definitely help with this also.
Gibson says 15hp increase. http://www.stangtv.com/news/gibson-promises-over-15-horsepower-for-your-new-raptor/
That exhaust with some catted downpipes will sound great IMO. As soon as the downpipes are available I'll be purchasing both.