Dang! Are you a lawyer or a manufacturer rep? But I agree with what you've said. I think this should close further discussion on this thread. The OP does not have a case. Moral of the story, if you want your warranty honored, stop modding the cars and enjoy them as Lotus designed it. They offer plenty of performance out of the box and I am saying this about the lowly NA versions too.What remedy are you seeking in this or are you just venting? If you are seeking a reinstatement of the emissions and powertrain warranty I don't see that happening. When Lotus imported that car they certified it to fully comply with all EPA requirements and all State requirements like California Air Resources Board. The car was certified with particular parts and settings that are compliant with those regulations. Changing those parts or settings removes the vehicle from compliance. If Lotus were to accept that your vehicle is still covered for powertrain and emissions it would have to be as certified... it is not. For Lotus to say it was in compliance would mean they are up against their assertions to the EPA that their car is compliant, when it isn't. How they found out is not relevant.
Also, please be very clear in all communications. Lotus did not invalidate your warranty. Lotus specified it will no longer honor the powertrain and emissions portions of your warranty. Anything else that hasn't been removed from compliance would still be covered.
Lotus, on their own, might want to make you a happy customer. They just aren't going to do it by risking huge problems with the EPA and CARB and the ability to import vehicles.
All the talk about getting lawyers involved... give me a break. Absurd! Again, what's your remedy? Money damages? Specific performance? Good luck with that.