Lotus has used Toyota components for a very long time. They use parts from a number of other manufacturers too. Their chief designer designed the MR2's suspension and the company's lab worked on tuning it... It's argued that they also played a great roll in the initial frame work of the vehicle (Toyota needed to learn the tricks to build a mid engine car that they could get on the market fast and without a lot of their own $$$ going into R&D... and they just happened to own controlling stake in a company that specialized in it.)
Lotus uses Yamaha designed heads (same as the 2). Toyota owned controlling stock in Lotus for a long time and as such they both contributed to eachother's product development and implementation.
Supposedly Lotus was also responsible for the fine tuning of the Supra's suspension although I don't know what generations and I've only seen it mentioned a couple times.
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