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Looking for some suggestions on cold air intake and exhaust modifications that will add a little more power to my '07 Limited. I have the 5.7, and the only thing I've done so far is replace the old aIr filter with a K&N. I have been researching the various CAI's and will probably go with the K&N 63. I have also been looking for a cat-back system that splits the exhaust to each side of the rear, but all I have found are single exhausts and a side-by-side dual. Maybe I should just change the muffler. I love the deep throaty sound it has now. I am looking for simple DIY mods to increse HP, torque, and fuel economy. Any suggestions are greatly appreciated.