You can get a few from the store here. Supposedly the Type 34 and the RSpec are some of the best motors you can get. Also try the Perfection 4.2 from www.toyeast.com. I have one in my SE and it's insanely fast.
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'65 Ford Mustang
All the RS goodies
Nissan Skyline GT-R R34 *DEAD*
Becoming a donor car for:
'04 Ford Mustang Cobra
Soon to be fetted, li-ioned, and all kinds of other goodies.