The stage 1 120 map is designed to go straight on to a standard car, nothing other than a good service required.
The stage 1+ 125 map is for cars with less than around 130k and a decat, ideally a straight through exhaust. You don't have to have the decat but it will help free up the system and give you a real 125 BHP for the S1+.
EGR delete is included for free if you need it.
All 306 options here: http://hdi-tuning.co.uk/ecu-remapping/cu...uning.html
The stage 1+ 125 map is for cars with less than around 130k and a decat, ideally a straight through exhaust. You don't have to have the decat but it will help free up the system and give you a real 125 BHP for the S1+.
EGR delete is included for free if you need it.
All 306 options here: http://hdi-tuning.co.uk/ecu-remapping/cu...uning.html