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SR20det
The red/black top option is only on the S13 motors. red was the earlier ones and balck the later ones, but they are essentially the same: i.e. you can throw a red valve cover on a blacktop and now you have a redtop. S14 and after all had black tops, and they are a little different motors.
I dont think you will get 450-500Hp and have good spool up characteristics. Big Hp=big boost levels=turbo lag.
Try using a T3/T4 hybrid turbo with A/R numbers around .4 to .6.
That should put you up in the 300-350 Hp range at around 15-20psi of boost with an aftermarket headgasket.
After 20psi you may want to build the internals like forged pistons and rods, but I am not sure what kind of max boost it can take and still be reliable on the stock bottom end.
The stock turbo is only good up to about 12psi, after that you are out of its efficiency range and you risk burning it up.
These kind of major changes require changes to the fuel system, including some sort of fuel management system and probably bigger injectors.
Keep in mind it is going to be expensive and probably require a custom exhaust manifold and large intercooler among a bunch of other stuff.
good luck
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