Alright I'm getting to the point where I'm choking a lot of power with my stock exhaust and I need a better flowing one. I have a 2006 silverado with 4.3L, supercharged running 9psi and tuning up to 14 psi. After 14psi is reached there will be a 30-40 shot of nitrous. I cant run the silly single pipe and exhaust manifolds on this setup

What Ive got for exhaust from another project:
2 hooker aerochambers-2.5". 2x 2.5" exhaust cutouts

#1 Is there a kit reasonably priced that I can just cut after the cats and weld up for duals?

#2 Should I just run the electrical exhaust cutouts after the cats and not worry about the rest of the exhaust? Then just flip them open when I want to go ***** out

#3 I like these, are they worth it: http://www.streetsideauto.com/produc...ampaign=Nextag
^^^ if the link doesnt show up theyre medium sized hedman headers for the 4.3 (not shorties)

I estimate 380-420 crank hp when all finished. Suggestions please, thanks