It will get louder without the cats. Hard to say how much though. My truck is louder than my buddies, he still has his cat with a flowmaster 40. I have no cats and turbo mufflers....
As for the h or x it doesn't really matter. either has to be in the right spot to work properly. An h will give you more torque, an x will give more horsepower. Your only talking about 1-2 HP/tq so its really not worth the extra cost and install trouble IMO....
As for the h or x it doesn't really matter. either has to be in the right spot to work properly. An h will give you more torque, an x will give more horsepower. Your only talking about 1-2 HP/tq so its really not worth the extra cost and install trouble IMO....