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The sky is the limit here. Once you see the actual costs of a forced induction engine you’ll probably ditch that idea. It’ll be somewhere in the $10,000 to $20,000 region.
The most common mod is The Cam Job (cams, intake, engine controller). This has huge gains in power and comes in about $2500 with no change in the economy or reliability of the bike.
Really, it comes down to your budget. A $2500 is great, $8000 makes more power, $15,000 makes even more power. Just stop me when your wallet is tapped out.