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most of the cheap ones are crap they just tell the engine its cold so it over fuels! i got a remap on mine and its worth double what it costs!!! you can get the st3 and alike for around the same price which are plug in remaps, if its the ability to take it off your after.
 

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All the cheap ones are is a resistor that deminishes the signal from the fuel temp sensor, and thus it over fuels the engine causing more power. The turbo boost isnt upt nor is injector timing. It can result in a blocking of the variable vanes as there will be increased soot, intake mani soot build up, and damage to the engine long term. [N]

Few friends use them on 320d's, and say there is little difference....
 
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