'06-08s all make the same power, same LS7. 550RWHP isn’t too shabby for bolt-ons and a cam. What did you expect? I believe LG made over 600RWHP with bolt-ons and a giagantor cam (stock heads) but even his posts about it said it wasn’t the street-friendliest. Here’s a 581RWHP stock head setup: Z06 **Video & Sound Clip LG Motorsports G7-XX Cam, with LG Headers** - CorvetteForum - Chevrolet Corvette Forum Discussion LG says it’s pretty DD-able.
Anyway, I still say 550RWHP is about typical for a cammed and LTed C6Z. More is always possible, but a cam that gives 550RWHP should be extremely drivable.
Whitey, just sack up and get a C6Z. There were few improvements from 06-07-08 and you see some really reasonably priced '06s now.
-TJ