Sorry but I am a little confused! 1st, Does my 09 SEUC have a Cat in the head pipe? Do you have to take the right pipe off and look into the pipe to tell? If it does have a cat, is it worth the trouble and or money to remove or open up the pipe? I ask this because a friend whose opinion I respect told me that the presence of the cat had no effect on sound or performance if I change my AC and high flow mufflers, to change head pipes or remove cat would be a waste of time and money. What do you think and what are the facts? Looking for it to run better from 0 to 50 and have a deeper louder sound. Not looking to squeeze every ounce of HP and TQ. Needs to sound better than my 03RKC. Thanks Guys, OH and Girls?