86 951 Driver

I'm not too familar with the turbo setup on these cars, but do they have a regular blow off valve or is it a recirculation valve?

black944 turbo

Recirc, aka bypass valve.

kev951

Recirculation valve. If you don't mind running rich in between shifts and potentially spitting a fireball through the exhaust tip, go for full atmospheric it if you want the sound! I recommend anything from turbo smart. They even sell a valve that can be configured how you want on the fly semi-recirc full resirc or true full atmospheric.