I got the 1FW314-SCI full kit (about $8300 to $8500 listed on the interwebs), all black and helical gears. Including the install, dyno and custom tune after I paid about 11-12k total.
I have what is stock on the GT350 + what is in the above mentioned kit, running standard 91 gas. The kit also...
I went for the Procharger P-1SC-1 kit on my 2016 GT350. For me it was a balance between cost and ability to return the car to stock 'easily' (warranty, ability to sell, ...).
TMS performance in Kent,WA did the install for me.
Stock dyno run: 456whp/376wtq
After install first run 603whp/483wtq ...