Impressive.... i once used a safc, on a peugot 206 with a 1.4 8v engine, and the results where noticeable, of course my only guide to tune it was a wideband and how quick i could run a certain distance (200 mts) but it did indeed improve... guess with what PHORB13 said, bout 156whp on an NX.... so guess you're still missing some 6whp round there! good luck!! oh.. and please share your safc tuning, avg temp, and level over sea... it could be of some help!