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I see no reason to get crazy on the longblock, with ~550whp as a goal. My car is just south of 500whp, and does it with 17-18psi on a totally stock GE-VVTi engine with GTE rods/pistons. You can hemorrhage money into stroker kits and cylinder head work - which is cool and all - but just not needed for ~550hp.
Personally, I'd rather save the money that'd go towards stroker/cylinder head (Headgames prices are freaking nuts), and buy higher quality components instead of the Chinesium stuff.
It wouldn't be a bad idea to get the fuel lines all squared away in preparation for the boost, but I don't think I'd bother with the fuel tank hanger and/or pump(s) until actually needed.
In terms of ECU, you have 3 basic options: A parallel ecu arrangement where the OEM ecu does everything except drive the injectors and coils, a standalone that fully replaces the OEM ecu - giving up cruise control and your OEM instrument cluster, or the recent-to-market Link G4+ Xtreme that allegedly fully replaces the OEM ecu and is able to do everything the OEM ecu could.
Regardless which way you choose to go, I would personally wait to install until I had my turbo parts ready to go on. I would install the new ECU solution and get the engine all mapped out and running correctly MINUS turbo - then I'd add the turbo and re-calibrate as necessary. Frankly, 95% of the tuning work for a programmable ecu is done OFF boost, so tuning for the turbo is NOT back-tracking or doubling the work. It does, however, provide the advantage of being way, way less likely of breaking something from an improper calibration.
In terms of brakes, you have lots of options. The OEM brakes don't "suck", but they can certainly use improvement. You can get relocation brackets for your front calipers that allow a bigger front rotor. You can swap on Lexus LS400 calipers, or RC350/IS350 calipers. These are all big improvements. Or you can whole-hog and order a Racing Brake package from Figs. A popular rear upgrade is swapping to the Supra TT calipers/rotors. That's an expensive undertaking for a small improvement. Figs also sells sweet rear brakes, but it's not a cheap date.
Final thoughts for now: If you plan your build and properly budget for it, using quality components that work well individually and as a system - you can definitely wind up with a performance car that drives and rides really well. Do not fool yourself though, it's not gonna be cheap. (Hint: most of the parts won't be coming from China)
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