I am going to be getting a new exhaust but I can't figure out which way would be more benificial. I have a set of gibson headers of the truck now but I want to run a high flow cat because factory is so restrictive. the cat on there now is only about 10,000 miles old so it's not bad. I was thinking about runing it out to duals with flowmaster 44. Someone told me that I would get more power if I ran a high flow cat to the muffler and out a large single pipe. If so how big??? or does anyone have any better ideas???? im wide open

 

ANY IDEAS?????