I have sold several 968 systems, all of them work well. Sorry, my mistake, they work perfectly
And my ECU controls check engine light also, no problems. You can leave original MAF intact no problem, you can hollow it out, no problem. When hollowed out, will they remove it and check if the grille and wire are still there? I don't think so. VEMS has closed-loop WBo2 control it can adapt to different fuels etc without issues and the idle and higher rpm tailpipe test is easy as pie. And with it being plug and play unit, it is very easy to just swap DME back in if so worried about someone removing the carpet and checking if you have original ECU. Standalones are not legal in many countries, does that mean you should not buy them if you pass smog test? It's up to the buyer but please don't compare standalone one to one with chips, they are totally different animals and offer different things.
968 is nothing special, usual Motronic car. Only lacks dedicated air temp sensor and that is covered also with my kit.
You don't need a knock counter with VEMS!!! VEMS uses original knock sensor and has integrated WBo2 controller! Please read carefully what I have written before!
And I have a very well working tune, didn't I mentione that already?
But purchasing and owning a standalone engine management system is not a human right and it is not mandatory so to each their own. Peace!