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We just had a dyno day at our local shop and figured I would see what my car pulled before I started adding things to it. It is bone stock except for a K&N CAI with a Halltech Beehive. Pulled 390hp/387tq in 4th on a Mustang Dyno. I was pleasantly surprised with the results.
The factory run the cars rich because it is safer and it keeps the Cats hot for better emissions. There is usually some HP gains to be had with a tune to improve the A/F ratio. 390 for a near stock LS3 A6 on a Mustang Dyno is very good. Now the pursuit for more HP begins.