im not familiar with the IS350 f sport,but they have a dyno graph of WHP and lbs of torque from a dynapack...
241WHP / 234LB-FT IS350 F Sport - TMC Motorsport UK SOFTWARE ENGINE / Transmission - Cold Air Intake - CB Exhaust
i cant upload the picture,but here's the link anyway...
https://www.facebook.com/photo.php?fbid=10152729360721780&set=gm.1453305698296257&type=1&theater
i know since we are N/A,8-10whp is a big help....they also claim the ISF will really benefit from their transmission reflash because it'll shift much faster then stock