I got the same intake kit and had it installed last Friday morning. I did notice an increase in throttle response as well as some engine noise. The 6.2L engine sounded much better and meaner at full throttle. I had a Magnaflow muffler and resonator delete kit installed that afternoon too. The whole vehicle sounds great now! Haven't noticed any mpg increase yet b/c I was stomping it every chance I got. I'm going on a road trip this weekend from Houston to New Orleans. Should be able to see what mpg increase I get after this trip. I'll post any results.