GIAC performance software for the 2004 R32® smoothly delivers a 5-13 hp and 8-15 ft-lbs gain. For optimum power gains the software must be coupled with a cold air intake.
now that is what GIAC has posted, its N/A so you can't expect a billion hp/lbs but i do know GIAC post up conservative numbers b/c they use a mustang dyno... the car will be alot more responsive after the flash though

work on getting the other bolt-ons and you then have a bad ass track car