Muffler help

[Genros]

Guys

I just made the purchase of my dreams
69 convt camaro, four link rear, heidts front end, six speed, willwoods, , true ls6 out of a 04 z06 ,ac...the list goes on and on. The builders installed flowmasters. I hate them, hate is a strong word I know, however I have never been one to be heard much rather seen. I used ultralfows with success in the past. Anyone have a recommendation that is best at performance and only load when the pedal is to the floor