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.

 

Free mods are: TB Bypass, MAF descreen, EGR cutoff.
Heads and cam depend on what you want now, and what you think you may be doing in the future (forced induction, nitrous)
Keep the factory TB unless you go blown.
If you go forced induction or nitrous, you will need a built tranny soon
A nice tune would be a good start. Allen (Farmtruc) does tunes. Go to www.ls1truck.com to get more info. DO NOT get an HPP3. You can get the 160 stat, or just do the BB mod with your stocker.
Flex-a-lite fans are nice, or you can go the cheaper route and get some LS1/LT1 fans off an f-bod and use the Flex-a-lite VSC or if you get a tune, run the e-fans off the PCM.
With nitrous it depends on how mild or wild you wanna go really. A 100 dry shot would be fine for having some fun once and awhile on the streets.
Radix would be a good overall supercharger...but as I said before, it depends on how extreme you want to get, or plan to get.
The sponsor links on the right can help you.

 

As far as heads and cam goes, i want to later install a supercharger. But then again i want badass performance without the blower. Would LS6 or LS1 heads be good? If so, which one is better? What cam would i need? Would i need to change my rocker arms, pushrods, pistons, valve springs, etc.??

 

If you are getting a cam you only want to change valve springs and pushrods. Make sure you get a blower friendly cam if you are going that way.

 

damn, tranny goes out an chingon is hating everything.. hahahah.