Slug - exactly right. Prochip's are the old Unichip's. APS used to sell their kits with Prochips for old skool shape WRX's (97-98)...but they since renamed their chips to Unichips.

Prochip performance!

I use to have one on my old MY98. With zorst, airfilter, water injection and Prochip all on a standard turbo I could easily pull 13.1s...

Its a very basic engine management system, but certainly not useless..

You can get it installed by that mob in O'Connor...