If you are using the SS for long drives/daily driver, I personally recommend not messing with the cam and intake.
I have heard of others using an LS6 intake with really no notable gains. Stick with exhaust, air intake, and maybe a tune and you will be plenty happy. And if your not, then maybe think about going balls deep.
Theres plenty of juice to extract from that restrained LS4 with simple bolt on mods.
Not sure where you got any of that info from.
There are MANY MANY MANY people using cammed cars as DD's and before the whole "trans is weak" comes into play, there are more people that have NOT had a trans failure than have had one(I've had a trans failure).
Next, LS6 intake is good for about 10-15 by itself BUT the reason it is being utilized more than the LS1 intake is cause people want to go with a cam next and the you get a higher RPM range with the LS6. If you don't want to cam the car then save your money and buy a LS1 intake. LS6's go for $300-$350, LS1's go for $50-$100 just for the intake, then you have to buy all the parts to make it work.
IMO there's no reason to buy some larger piped exhaust if you're going to keep the restrictions at the motor, kinda defeats the purpose unless you just want to make noise.
OP, Yes the few guys that are currently cammed did go through a bunch of shit BUT they were also the FIRST guys to attempt it. As with all new engine modding, there's gonna be ups and downs.
YES, we have LS6 heads.
I don't think anyone on HERE has done the LS6 intake swap yet. I have 90% of the parts sitting in my garage and will get it done when I can, but I'm also removing all of the DOD(ie:lifters, valley cover) shit from my car too.
There's pretty much everything we need on the market already:
Headers- Doug Thorly
CAI- K&N, Cold air Inductions
Exhaust- magnaflow has a bolt in kit or you can piece together your own
Cam- I recommend finding someone that can Spec you a cam
Turbo- Cartuning, they have a inter-cooled and non inter-cooled kit
Nitrous- piece together a kit
LS1tech.com has a bunch of info about modding our cars. Just go and "lurk" the site if you don't feel like joining another forum.