im running a emanage ultimate on my s1 took 2hrs to wire in very easy and precise to tune complete fuel and timming maps as well as individual cylinder adjustment prob best piggy back ecu i have ever used , nistunes are great but there are other options out there, especially when it comes to the fun of a s1 ecu but the trade off is a much stronger trans in s1 mine is shift kitted and ratted to 315awkw by mv autos,
ultimate cost me $500 new from japan 2-3hrs of my time $25 worth of bits and pieces i played around with basic tune then got it cleaned up $200 so put me back less than 800 ok mates rates on tune but still would only be about 1k ? for joe blow