Should I change my cam?
Back when I had my 2000 ss I ran a Futral f11 228/230 .575/.595 114+4 with tea 5.3 heads and had a Flowmaster with a cut out. I can't remember the exact numbers but I want to say I picked up 10-15 rwhp with the cut out open on a dyno.. don't quote me on the exact numbers since it was 6-7 years ago, but it was enough to make my jaw drop lol.. just do a cut out, way cheaper than a new cat back. For 1k I think the stall and tune will wake your car up. 3800 would match your cam well.. get a big Trans cooler 11x11 and mount it where it gets good air flow, it's very important. May want a temp gauge to monitor it also.. if you do a truck pan and filter you will gain 1qt to help with cooling also. I found my aluminum truck pan on ebay and has a drain plug for $60.
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I agree with the last 4+ post. I had a PT4000 and it was bad ***. Cutout gained me 10hp on the dyno (flowmasters do sound good) but open that cutout for the power 
. Your are headed in the right direction IMHO.
. Your are headed in the right direction IMHO. Yes 3 " cutout and I would go with an ss4000, they out perform the 3600 and since you don't DD, why not go higher.. plus the SS series drives very well.. lots of people DD the ss4000.. I've had 2 of them now and love them.. you will want some sticky tires for sure!
Manual cutouts are dirt cheap now if you didn't want to spend the 250+ for an electric one. I would also be curious if you're going to run out of fuel injector if they're stock with the new mods.