BHP for all st185's was 204bhp. great cars not a lot to worrie about except general wear and tear but these cars are getting old so do need checking over. look for rust worn suspension etc, brake pipes corrode mine bust the day i got it lol. Insurance is pretty cheap mine is currenty insured by mt 21yo Fiancee for about 500 quid. rear diff bushs do go. If its been tuned make sure its had a steel head gasket fitted as they have normal gaskets from the factory and do go if its running too much boost. They are an heavy car even the light weight is heavy.
On the good side they do handle really well but standard 0-60 is about 7 secs so not that fast but do shift ok once moving.
Visit
www.gt4oc.com loads of info here
Ive got a 1990 widebody GT4 A had it since Feb and spent alot on it as it was a shed when i bought it.
For sale by the way £1495