:exactly: The slight improvement you get without the cat is not worth the headache you get from the dealer. You have a brand new truck, stuff happens. You will be very satisfied with a four inch system. Check out our Silverline systems before you make your decision. You will be glad you did.Mark Craig;1569179; said:KraftyHD,
On folks with 2004.5+ trucks we always reccomend that you start with a cat back system and see if it gets you the EGT drop and turbo spool up increase you need, if so stop there as you won't have to add fingersticks and block off plates etc. If you need more then add the front pipe and if you are lucky you might not get a CEL light anyway!! Plus if you get a cat back vs an Off Road System you can bolt the cat back in at any time to help keep the dealers happy warranty wise. Plus the cats on new trucks actually flow pretty good as compared to a few years ago!