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Those that market exhaust systems are preaching 25-35 RWHP. I have not yet seen cars owned by individuals with these systems installed show before and after dyno tests. So yes, its possible, but no, I'm not ready to jump on the "LTs and X-pipe equals 30 RWHP" bandwagon just yet.
CAIs alone have been showing anywhere from 6-11 RWHP. The biggest gains are coming from a tune, and besides adding power, what really helps is bumping the rev limiter up over 7k. The motor is very handicapped from the factory given its 6600 rpm peak HP and the "soft limiter" coming in at 6850 (drag racers know that shift points need to be several hundred rpm above peak power, depending upon the shape of the HP curve and tranny gearing).
When it is all said and done, and the most common "bolt-ons" are available and being used, I think you'll see M6 5.0s making an average of 420-435 RWHP SAE. A6s will be somewhat less, of course. That should be in the ballpark of the LS3, perhaps a bit less overall. The LS3 will always have a somewhat better powercurve (its that displacement thing).
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