I ordered a AFE intake [one that replaces the battery box] with the proguard 7 filter and it went on pretty well and mulled over the idea of the 4'' exhaust for a few days. Called them back and added that to the truck. So far she purrs pretty well. the turbo has a little whistle when it comes onto boost and the exhaust is no louder than stock but seems to flow better by miles. The engine may be a touch louder due to no back pressure, but for the 30 miles home from the muffler shop I like it. Thanks guys, I guess I'm through modding until some of the warranty runs down.