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A good TCM tune in the L99 is worth it alone. You will gain very little in terms of hp and trq but firming up the shift points will enhance the performance of the car.
The tranny used for the L99 is pretty picky. If you go somewhere, be sure to ask if they have ever done the L99 before and talk to people who has been as one mess up will toast your tranny.
Personally I recommend Ted Jannety. It is a email tune but his tunes are among the best, if not the best in the US. His tune is what I'm running in my L99 and the difference is like night and day. He also has a "Free tune" program where if you decide to add more mods to your car and you buy them from him, he will tune your car for free where as if you go anywhere else you will have to pay to have your car retuned. I highly suggest you at least consider him.
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