I have the Syvecs S6Plus fitted but I couldn’t recommend it.
Reason 1
It was sold as plug and play but was far from it, granted I did ask a lot of it but was told (before I bought it) that it was more than capable of doing what I wanted. With a lot of work and a lot of money it was possible but far from easy. I went an alternative route that cost me a lot in mapping to get the car how it is today because none of the Syvecs mappers filled me with any confidence. I went for a bespoke map built from the ground up, all from scratch. Lots of dyno time, lots of road testing, tweaking on both until it was done.
Reason 2
Support was and is (in my opinion) terrible for an ECU that costs what this does, their forum is dead so if you are in urgent need of help you are f@#ked unless someone who knows these is a phone call away.
My ECU is maxed, no more inputs, no expander kit for this either. That said, it’s got great engine protection and decent traction control two things I wanted.
Reason 3
Another guy on here has the same spec car as me (tiptronic VVT-i) but in single turbo form. We bought the ECU at the same time but his needed mapping before mine. He went with a Syvecs recommended mapper and I believe his car still has issues that need sorting.
Summing Up
Would I recommend going standalone, yes. But I would choose a different ECU. Either a MoTeC M130 or MoTeC M150 and I would do my best to secure Fraser MacKellar as my mapper of choice. Yes the MoTeC will cost you more than a Syvecs as you have to pay extra to unlock parts of the ECU that you get with the Syvecs but the piece of mind you would get and aftermarket support, to me, would be worth paying the extra.