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Yeah YNOT that is pretty much on the money. It is a very basic form of emissions control. everything else works the same as a TD42T fuel system, it just has a trim, it adjusts stuff all really and can be uplugged (as well as tps and needle lift sensor and will still run fine. With the TD42Ti, the timing cant be adjusted much over .68 (I think) as it has a bit of a hissy fit. To get the best out of it though leave it all hooked up.