they make 196 hp but lose power fast with mileage and lack of proper maint, he was probably around 160hp over the years. When a perfect running E30 M3 is on the road its hell to pay
Buuuuut being that they are a track spec race engine from the factory, they dont last very long...
If he was running properly it makes 196crank hp and you make about 189 and it weighs less and has way better gearing, you do the math
but good call they are excellant cars, that make my pants dance hehe