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I'm managing the design and build of an insurance website at the moment. The car list supplied by Thatcham has the PPP listed as standard cars. As an example the WRX in 2004 has....
WRX (221)
WRX (261) - this being the PPP, I can't remember the exact bhp figure but you get the idea.
The STIs are listed separately. All have their own ABIs, I'll check the insurance groups for them tomorrow, pretty sure the PPP is same as standard.