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Message: [QUOTE="Powerstroke Cowboy, post: 1560144, member: 610"] Okay, I think I understand where you are coming from. At 500hp you will be fine with your stock bottom end, as long as the tuner does his part. As in, good timing tables and tuning that does not create high pressure spikes in the cylinder. Your 230/100 will have no problem supplying the fuel for 500+ hp. I do believe with the right supporting mods you could even tap 600+ hp. If you are looking for 500+ hp and the ability to spin 4000k rpm, here is some mods you will want IMHO. You already have the injectors (230/100) to do the 500 hp you want, and more if wanted. HPOP, I would look into a adrenaline or as you mentioned a CNC stage two. Now for fuel to supply the injectors. Dual SD pumps is not a bad idea. The factory fuel bowl will be adequate in this situation. But if you do not want to keep it, that's fine as well. CNC made/makes a cheap kit that works with the stock SD fuel bowl. A sump is not needed. I would do shimed 910 valve springs or the equivalent to handle the higher rpm, 40 psi of boost and back pressure. Stage one pushrods, to handle the higher rpm, 40 psi of boost and back pressure. ARP head studs or equivalent. If it's a seasoned block, head combo do them one at a time. If your looking to keep the factory style turbo, then a GTP38R , Garret or KC turbo will do. If you want a .84 A/R exhaust housing then you will, without a dought, want to gate it. I do believe KC has the better/bigger exhaust wheel. I would lean that way. Built Transmission to hold it all together. Last but not least, tuning. Pick somebody who has a good track record with the injector/turbo combo. Matt@Gearhead used to be know for good tunes for that combo. I am sure he still has the tunes needed for the job and will tweak them as needed. Times have changed though. I am not up to speed on the tuners out there now. I do my own tuning. If this is not what you are looking for, yell at me. LOL [/QUOTE]