I've not really had a chance to report on my recent upgrades courtesy of Iain and his team at Litchfields but what I will say now is that I'm glad I went straight for the Stg 4 - car is great and I feel that I have quashed any thoughts of further power increases (for the time being at least!).S14 you'll find you have to for a new map when fit different intakes and injectors with the other solutions as well. Straight to stage 4 is a more cost effective route
I'm running 0.7 boost on the road map as standard and 1.27 on the race (Iain can correct me if I'm wrong). These are adjustable of course. Using the higher boost certainly makes a big diference.
My next trip down will be for brake and suspension upgrades.
Meant to add, I decided to go for the Akropovic system - as well as sounding fantastic it looks the dogs bits. The Miltek offerings are certainly good systems and its great that there are choices available.