I've found some cheap tuning parts for sale and wonderd which is the best next move for my RS.

My car has got the usual 195 chip, stainless exhaust, pipercross filter, pace intercooler running about 14 psi.

The two items are a Stage 2 hybrid turbo, not even sure what the difference is from standard, and a polished head with piper cam and vernier pulley. Both about the same price and i can only afford one so which one is the question i ask you, any advice is much appreciated