I have nearly identical sound between high flows and no cats. Cats or no cats, you'll never have a flowmaster that sounds good in my book.

 

I really like the sound of my new Banks Monster Exhaust it's not too load but sounds great when you geter done https://www.f150online.com/forums/me...ck-install.jpg https://www.f150online.com/forums/me...img-0112-2.jpg https://www.f150online.com/forums/me...6-img-0129.jpg

 

so this is what i am thinking as of now! removing the rear cats adding a 14" sido magnaflow with dual 2.5" pipes exiting! thoughts please??? looking for a little more sounds but not too extreme and would love to increase hp/tq rather than decrease!

 

okay after doing some research, i have decided that i am going to keep my rear cats because of the cel issue that I really don't want to deal with! back to square one! decisions desicions!