Cats or X-Pipe.. Alot of HPDE use.

I have built the car for occasional street use, friday night get together or Sunday morning blast, but mostly track fun. I will be running....
Forged LS7 with 12.0-1 Compression ratio.
Ported heads with cam, springs, TI retainers, Morel Lifters, chromoly push rods. Ported T-body and Intake. LPE CAI. AR headers.
LG coilovers
Hoosiers
T1 Sways
Caravaggio seats w/ harness bar and 5 Pt harness
Stoptechs
LG Spindle ducts
Exedy Clutch/ Lightened flywheel
I have AR headers 1 7/8 with High flow cats. To make the most out of this engine do I need to go catless. I know with the X pipe it will be a little louder and I will probably smell a little gas. That aside...
How much power am I robbing from my engine, and those cats are going to be under a lot of heat and pressure..
What should I do? Even if the HP gain is small, Perhaps the engine will run better during those 20 minute HPDE...
Your thoughts... Anyone gone from cats to no cats and see any advantage at the track?

