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Suppose Tesla offered an upgrade package for your Roadster:
90kWhr battery ( top of the line cells like the Model S Sport )
SuperSport PEM paired with SuperSport motor. ( technology from the Model S Sport )
Pricetag: $35k ( really $50k, but they give you $15k credit on tradein of old parts, you could probably sell your old battery+PEM+motor for more )
What you get ( upgrading from non-Sport Roadster ):
390 mile range instead of 245
420hp instead of 288hp
0-60 of 3.1 seconds instead of 3.9
1/4 mile time of 11.2 seconds instead of 12.9