I use motorsport cats (100-cell) with lightweight stainless pipes on PPE LT headers with a pair of Spintech mufflers -
https://spintechmufflers.com/
I have v-band fittings to install spiral flow resonators for noise sensitive tracks that go under car around where the seats are located - it takes 5 minutes on my hoist to swap out the straight pipe and install these resonators to quieten down the car.
I use an Australian manufactured unit but in the USA you are probably better looking at Moroso.