I have ECU's in stock and will flash them likely next week or so and have them available. Limited stock on these for purchasing for the C folks.
You need to do a Proxi, yes. Very simple with MES and hardware. Should have it anyway.
No recalibration is really needed. I just like to do it anyway with ALFAOBD software. I don't think it is needed as much as I previously thought. So I am stating at this point, you can do it or you do not have to. The accelerometers will re-learn. The MES software and hardware is about $270 (with SGW bypass) for everything you need. I suggest it anyway. Nice to have the capability of oil service rest to diagnosing to clearing codes etc...
You will not find with the ECU alone that this will save the ST springs, the main issue is the springs are improperly designed. I suggested our springs and the ECU for an improvement you will be amazed with. Really! Our springs do not lower as much as ST and are not as soft as ST or should I say improper rates. Although our springs have more rate, they match well with the D version ECU with GTAm suspension tuning. Our springs were developed using the GTA springs, we looked at the ST and H&R and developed ours to outperform all of them. Increased the rates, wire diameters were changed, coils designed to function better and give minimal lowering. Not only does all of this equate to better handling but also comfort and less damage to the car since it does not sit as low.
We now have two options for springs. Performance and CORSA. Performance is our full linear spring set up. These give much better handling than stock or any lowering spring on the market as we actually tested our springs for about 8-10 months before bring them out. We have city, mountain and track testing (Laguna Seca and Willow Springs) done on these springs. These give a more sporty feel to the car, nearly no bounce, no teeter back and forth, bounce and teeter can damage the front splitter to side skirts and more. We have put our springs through the ringer and we have not experienced any issues at all and all teh reviews here will show the immense improvement over ST.
Now, the CORSA. These also do what the Performance springs do but more. They are a dual rate spring. So initially they may seem like there is no change from stock to these. This is a true GT spring. Comfortable but when pushed hard, oh it will perform. These are a 12% increase in spring rates over the performance springs. Again you will not notice until you push the car into corners, then those rates pile up quick and the car will push through the corners as if it were on a race coilover setup. Unmatched performance with both springs. Don't be fooled though by the initial feel of these springs just driving down a road, these are high performance springs and match well with the new software. These have also been tested the same way as the performance springs and developed over an 8 month + period to get then correct.
ST was a spring most purchased at the beginning. It was the only option that did not lower (.8") as much like H&R which slammed the car too far that the suspension geometry was thrown off and cars got heavily damaged from these unless you delicately drove around town. We are past this now, dust in the wind. KW/ST I have since parted with as all their products I tested including their very expensive coilovers were badly designed. 2.0L springs sat too low in the rear and performed badly. DDC kits are made for street use ONLY. Not track and they just lacked in performance. I have had many make the switch to my springs and have been happy they did. I have even had a few remove the KW DDC coilovers for my springs/Suspension ECU and state this setup is a huge improvement over the KW DDC.
Sample car below.
Hope that helps.
Maybe others with either will chime in.
Ciao!