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If you can buy a full greddy turbo system, with all the piping, plus internal parts for your engine(Don't swap out the internal, you're going to blow the engine) proper intercooling, and then tune the CPU, be my guest. Sure, it won't cost 5000$, but my point is: A brand that creates Superchargers for mustangs cost around 3000$+ shipping and taxes. It can make a mustang gain 50-60%+ it's horsepower. A turbo would gain MAYBE 50hp on 15PSI.
This is 50%+ hp(200+hp) gain on 7PSI.
That's crazy in my eyes.
Plus, a supercharger is always more efficient off the line - Second you touch the pedal, is whining from 500pm till your redline.
A Turbo? 3500+RPM until the turbo spools up. That's valuable seconds/milliseconds you lose.