I dont understand why people think it is easier or cheaper to extract power from a turbo engine..
Take your average rb25 spend 5000$ you will probably get a fairly reliable 450hp, give or take..
spend 5000$ on an injected holden v8 and you will also get a reliable 450hp and heaps more torque down low, spend the same on an Ls1, easy 550hp
The only real advantage is you can do it to a turbo engine without having to open the engine up, just install a bigger turbo etc..But rebuilding an engine isn't hard for those that know how just that people prefer to just buy bolton bits these days cause it seems easier.
I knew a guy with a 308 5 speed vb commodore, had a 286 cam a holley carb, and heads he ported himself at tafe and running crazy high compression (12.5-13) it pulled easy 12s and he even beat a ferrari in it.
The only trade-off was he would blow a head gasket every few months, but now you could build that whole car for 5000$