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You are going to need to ditch the catless off-road pipes and get some high flow cats if you want it to be that quiet.
Keep in mind, you are losing 4 cats by going with longtubes and off-road pipes. That is a lot of noise reduction you are losing.
In regards to question #2, I have TSP headers. Their off road pipes neck down to 2.5 inches to meet the stock system. I would assume the Kooks have a similar setup, but I have been known to be wrong.
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2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) on CamMotion 8620 core, BTR Platinum .660" Dual Spring kit w/titanium retainers, CHE bronze trunnion upgrade, stock heads milled @ .015, Melling HV 10296 oil pump, TSP 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, Stage 2 Ported Throttle Body, Vararam OTR CAI, Mike Norris Gen 2 catch can + GM 1LE clean side separator, 160º thermostat - Megan Racing adjustable coilovers (lowered 1.75"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI
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