02 z71 suburban 4x4. lifted, rolling on 35 inch mudtires. engine is the stock 5.3. only mod is k&n in factory box. motor has 98k showing on the odometer. this weekend, i am getting an 05 LQ9 engine installed. we are also doing a cai, exhaust, and nelson high performance tune. new motor has 15k miles. im starting to get cold feet, maybe due to the cost, but im wondering how much noticable diffrence i will feel with the new set up. im hoping it will be really noticable. im scared it isnt going to produce the results i want for the money im spending.