Turbo for sure. superchargers are great but they put drag on the engine to make power, whereas a turbo uses free exhaust gas energy to make boost and it's more reliable (which is why it's very common) STS makes remote mounted turbos that go where the muffler goes. it's more efficient and stays cooler, plus if you pop the hood it won't be as cramped and it won't reveal you're running it until you turn the key and rev the engine.