The intake flows just fine as-is. Virtually zero gain to be had there, unless you look at "benchmarketing", so everything on the intake side is just $$$ in their pocket for little to no gains.
The same with the cats.
If you want to change the sound, sure the muffler swap will do that, but don't expect a huuuuge difference in power.
I'd concentrate on paying it off 1st. It'll give you a chance to get used to the car, and time to think about what you really want so you won't hack up your car and regret it later.
This probably isn't what you want to hear, but you asked for advice, not someone who agrees with you. It looks like you're having regrets for not getting the SS. The mods you listed come to about $3400, give or take. Add ~3400 to the price of your V6, and you'd have an SS.
James 1:25 Ordered from Faulkner Chevy #NKCF02 1100 5/8/9 2000, 3300 7/16/9 TPW 7/20,GOT MY (low) VIN! 4000 7/24/9 ,Picked up 8/7/9!!! Signed Litho #45. Car signed by FBodfather 2011. Service: Jennings Chevy in PA. We don't "drift", kiddies... we POWER SLIDE!
MOTM/COTM Sept 2012 Pro Patria Vigilans
Click the pic.. I don't tolerate fools.
Last edited by patriotpa; 09-03-2018 at 07:56 AM.