Well, it could be a toss up for you then. The Borla's are definately not as loud as the Flows but would still soud good without cats. It's a very tuned mellow rumble. They look kick*ss though and not everyone has them so it would be something different especially if you show the car.
I didn't see in your sig where you have the car lowered. If you did then speed bumps might be an issue. I have no clearance issues even though the pipes are lower than stock. The covers actually are lower than the pipes but they have quite a bit of "give" room if they were to be knocked. I looked under my car when I was in the driveway today and the pipes and muffs look like they are brand new still.
Just some info for ya just in cas you wanted to know.
Have a good one
Brett
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66 Tahoe Turquoise Coupe
Laser Red 96GT Ragtop
30 Years & 30 inches apart in the driveway!