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I have a 08 535xi and I am thinking of getting a tune on it. Right now I have two options I am looking into.

One is a TFT (TrueForm Technology) tune.
The other is a JB4 tune.

Both would give me about 70-80 horsepower and 100 torque.

What I am wondering is if anyone has done either of these before and if they are worth the money and really do give out that performance? Or even if there is a better tune to get?

Suggestions/comments?
 

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There is so much data out there on this, but the big three are MHD, JB4 and Cobb.

Each one is specific to the users needs.
 
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