I don't know how many of you autocross, but I'm in BSP and wondering what kind of HP #'s I can expect from modding? I currently only have a header and exhaust with everything else stock otherwise. The car runs great for what it is, but is it possible to achieve 40-50hp improvements from bolt-on parts, different carbs or ECU tuning? Street prepared class prevents me from doing anything to the bottom end and making any real changes to the head.

My car is a 240Z with a 280Z motor swap. FI is not an option as I plan on staying in BSP class.

Thanks!