175 hp seems light on power? I would think being a BW it's a heavier boat?
From the sales brochure at Thunderbird Yacht:
Mercury 175hp Supercharged Verado Power – Smooth, quiet, and fuel efficient. The owner reports a top speed over 50 knots. And an easy cruise at 30mph. With 1412 hours total. Serviced yearly with receipts. Most recent major service was new high pressure and low pressure fuel pumps.