i have a 91 f150 5.0 4x4, and im wondering if i took of the cat, which i do not need for emissions, and ran straight pipe to a flow master muffler, would it cause any trouble? im looking to get a bit more power, and some sound from it. any thoughts? thanks

 

well i have a 351w in a bronco 2 4x4 with no cats connected to a flowmaster dual exhaust one thing it is loud no on power i haven't seen any gains
but i do get a much less heat range in the engine compartment header also work with the no cat idea.