A rough guess is about $1,000.
Dug up my invoice; pre-dyno inspection, heat exchanger installation, lower downpipe installation, and driveshaft installation was $1,000. The hourly rate was $125 at the time (looks like I got a different rate on other services I had performed at a different time.)
Dyno tuning was $300 + $599.95 for Q60 calibration service + $100 EcuTek USB license key + $250 for EcuTek flash license + $300 for EcuTek Bluetooth interface (cost for the tuning service: $1549.95).