I wanted to get y'all's opinion on this setup. I have a stock 2002 LB7 that is due for injectors. I intend to replace them but I want to go with 30% over injectors. Would my stock components be able to handle these injectors. I also intend to get a FASS 165 lift pump to help with fuel filtration and fuel supply. Would I need to tune the truck after? I also plan to get a bigger turbo but in a couple of years. I am looking at Duramaxtuner's Stealth 64 and 67. Which one should I go with? I want that loud turbo whistle but I also want reliability and to keep my stock components. What do y'all think?
i think that this largely depends on what tune you have on the truck, who made it, and how heavy your right foot is.
you will need to tune the truck to run 30 overs or it will just smoke like crazy. (you may want to look at the SAC injectors since they are supposed to be more reliable). Any time you add power you increase the risk of things breaking.
You can do everything your wanting to do on a stock engine and it will run fine until it doesn't. If you are after reliability your going to need to spend the money to do the build right. That means an upgraded transmission is in your future, and things like headstuds are probably not a bad idea. Additionally, before adding power you should make sure the truck is 110% in perfect mechanical working order or your funds should go towards fixing problems first.
With reliability being the primary concern, you should either keep it stock, maybe add a lift pump and some other small stuff to improve injector life and reduce wear. Or you should do the injectors, since they are due, add a light tune so you dont dump diesel everywhere out the tail pipe, then build the trans, then do your turbo and other toys. Its important to balance the fun upgrades with the functional ones. Adding big injectors, a turbo, dual CP3's and the like is fun, but if you have a stock engine, stock rods, stock head bolts, your likely to run into problems at some point. To keep the reliability factor high you need to also upgrade the engine and transmission components as you add power.
generally speaking it is considered safe to add 50-100 horse power over stock without any major modifications to the truck, note, that upgraded injectors are NOT required for this level of power. So the gains you would be wanting based off the injector upgrade would require a built transmission at minimum. Yes you can run the truck with the 30 overs and a safe tune that wont break things, but if your buying 30 overs for power, thats probably not the direction you are looking to go.