" That car is awsome!
I have three of them, two 425i's, one trackday project and the other as a sparepart donater
and one stock Si from -88 that runs like a dream
If you are going for bigger exhaustvalves, look for cylinderheads from the 2.8 liters or 2 liters S or Si, then you dont have to rebuild your current.
I'm very interested in the mods you've made and hope that you could share some tips "