Its not stupidity pal, far from it, just a different trade so dont appologise for asking questions, thats what teh forums for

Closed loop is a feature late cars have as std that allows the in built sensors to control your fuelling properly and as such allow reasonable economy with very good and very clean everyday running. Traditionally tuners have reverted back to old fashioned mapping techniques to give the YB more power but we have a new range of chips that retain the closed loop feature right the way up to 750CC and 600Bhp+ thats fully compatible with the ecu you have as std. (Feature in Perf Ford coming soon )

For stage 1 to stage 3 we can supply this system off the shelf ourselves or via our dealer network (you have AP Tuning Locally) should you prefer professional fitment and tuning, which i personally strongly recommend because ideally you really need the fuelling at high boost checking, as with all due respect, your fuel system is probably 11+years old now and in unknown condition. Admittedly the system ages very well and its probably more than capable of the increased power hike, but better to have the fuelling and boost checked and verified as safe by a pro.

Hope this helps.