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Im looking to get feedback on what would be a better route for a tune. The Alpha 7 tune is about 3k while the renntech tune is about 3495 while the cheaper of the two is producing ~40hp more. Renntech has been doing Benz tuning for years whereas AMS is fairly new (to the best of my knowledge) to Benz but has been a proven tuner for the Nissan GTR's.
I also have been looking into a flash. I've decided that I may just try and save up and go for the Alpha 9 package. I've seen what they can do to a GTR and I've also seen their Alpha 9 E63 which hits 10's in a quarter mile.