I have been in many Lotus on track. Elises can indeed be made much better than stock. But, I have been in more poorly "enhanced" Elige's than well upgraded ones.
Interesting how original poster goes straight to hardware upgrades, but has made no mention of alignment 'enhancements". This is one of the biggest areas one can improve upon (removing the setup designed to protect the common idiot) without changing a single piece of hardware. Hint-->my recommendation, start here. One can improve both road and track abilities at the same time, depending on your driving style. The magic of these cars is compliance, take it all away and its just another oversprung, twitchy sports car.
16 Maserati GranTurismo Sport Ext Campio /Grigio Chronos w/full MC Carbon Fiber interior trim, Stock for now
18 Alfa Romeo Stelvio Visconti Verde/Brown Leather Remus Catback,Eurocompulsion Phase 2 V2 intake, 390HP/443ft-lb Tq!
16 Range Rover Sport HSE, Montalcino Red w/Ivory Leather-[/COLOR]- 456HP/412ft-lb Tq
12 Maxda MX-5 Miata GT PRHT True Red/Black leather
11 Lotus Evora "S" Persian Blue, Grey/Black Suedetex/Leather