I think I have seen this question before and I think the answer was about $10,000 to turbocharge a V6 after you rebuild it with forged pistons, shotpeened rods, O-ringed block then added bigger injectors and fuel pump new computer and the turbo things add up very fast! But the cheapest way to get into the boosted V6 scene by far is the L67 supercharged V6 that you can find at a local wreckers if your patient. you will need the ECU and wiring harness too. It's not hard to just swap the whole motor in your car only a bit of work involved with electrical connections hoses and about 14 bolts I think plus take the bonnet off, again it is not as hard as it sounds
