using bullets vs flowmasters

Ive never personally done this, but have heard of guys picking up about a tenth or more from changing from the average flowmaster 40's to a straight through like a dynomax ultra flow...i would assume even more from a bullet, since all it is really is a resonator to knock off a few db's from open headers...Dont know if this is a street/strip car, but bullets on the street are going to be loud- Something i like but not sure if you do and not sure how often you drive your car on the street...its also illegal, so if you know that the blue shirts in your area are a bunch of douches, be careful