New rubber Whats next?

[68 C-10 KID]

Hello brothers & sisters.
I received my new 28x14.5 QTP today along with the long length kicked out pan-hard bar to clear aftermarket diff cover.

Marv has been such help with his advice on the wider tire and lower launch RPM to better my 60 & to make it more consistent. I have also read up on everyone's input on the 3" exhaust. I have the 1 3/4" hooker super comps with 3" collector. I'm currently running 2 1/2" w/ X-pipe and delta flows.
The new pan-hard bar is going to hit the exhaust so its time to run 3" since my 406 put up low lower 600hp.

My question is should I run another x-pipe system and what types of mufflers are out there to run besides flow-masters?

Thanks for your input in advance.