Looking to buy a new chip for my red top 4x4 from MSD to run with 803 greens.(in NZ so a bit hard to get live mapped) Thought while I am at it I should probably get the closed loop option to hopefully help my fuel consumption. So a few questions. Does this system use a wide or narrow band O2 sensor and is this included in the extra 100 GBP that this costs. Is this system any different to what is used on a green top 4x4. I am under the impression (probably wrongly) that the best (but still safe) economic fuel consumption is achieved at a figure leaner than Stoichiometric but thought a narrow band sensor only really can sense if it is at that figure or not. Interested in someone explaining how the system works if it does indeed use a narrow band sensor. Also can anyone confirm if their (MSD's) chips have the option set to output serial data to allow the use of the IAW software. Thanks David