300WHP can be done with ease, but probably not as easy as you like. It's a commonly repeated recipe but you have to do things right or you might lose the engine.
If you plan to hit 18psi you might as well do a metal gasket now.
Follow this order:
fresh fluids, fix ALL leaks, check/replace all hoses (oil cooler too), check/replace head gasket, check/replace spark plugs & wires, check/replace timing belt, check/replace clutch, check/repair any codes. Then....
3" dp, 3" cat, 3" catback, air filter,
fuel pump, 1UZ KVAFM+ 550's+AFPR,
boost controller+ wideband gauge+ SAFC or something to trim with, intercooler and hard pipe kit,
57Trim Ct-26
stir, tune and serve. Serves 6 cylinders.
Should get you to the target. Although at 18psi you might be a bit higher.
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