The Active Processor is $1295 installed. Active are currently working on MSD81 and when that is released then i can release to everyone here accordingly. The installation requires rewiring of the factory ECU plugs and so i require it back if you want it removed before going to the dealer. I have fitted many to 335's, i did the last one on friday. I recently recieved my latest stock order of 5 units and have 1 left. More will be coming soon.
I haven't used the SSTT or seen one installed so can't comment.
If you want factory Warranty to remain on your car, Do NOT put anything on the car that may put that into question. All tunes are sold for 'off road use only' i just don't see the argument that you want to modify your car and if something goes wrong blame the BMW and scam them for warranty. (My 2 cents)
Andrew