The standard nosrams dont come with the heatsink and fan. The TC spec fan is a necessity for TC's where 4.5's are common place. Unless its a tight track on an uber hot day you should be ok with out the fan in 2wd. You probabaly want to keep that speedo in your 4wd though because in 4wd the fan is much more important and on the Nosram I think the fan is hardwired on a very short cable so can only be removed by chopping the wires.... no biggie but might invalidate any warranty.
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