the new fuel management system by turbo XS that a lot of 350Z guys are using seems to be very popular...yes it's close to full standalone management at nearly 1000...but on their site it stipulates that their system doesn't advance timing via altering the crank signal like a piggy back...but rather it fires the coils when you want therefore you are putting in actual timing #'s BTDC instead of plus or minus on the factory curve...so I guess the UTEC system doubles as a complete ignition system as well in a sense...