I have a 99 LM7 5.3 and I'm looking to really increase some horsepower. I have a polished K&N intake, 4:11 gears, and a true dual flowmaster exhaust. What are the free mods i can do to my truck? I need to know what heads, cam, throttle body, transmission, rocker arms, intake manifolds, etc to install. If there are any mods i can put in, please let me know. Would a Hypertech programmer and a power stat work good? What about fans and cooling system stuff. What about a shot of NOS? What are some good supersharger systems? If i get a supercharger, what engine stuff should i put in to prevent screwing up my engine.Basically i want a full list of parts i can install to realy beef up the engine. Thanks.