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I just want to know of the real life performance gains of people who have just added a front mount compared to their stock intercooler. Is it only when the stock cooler is hot, ie. on a 1/4 mile basis, 1st and 2nd gears wouldnt be too much benefit, but as you go longer in the gears, the turbo would heat up and 3rd and 4th gears would be much hotter entering into the plenum.

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stock ICs heat up more quickly, so you might notice that. Also, stockers have a bigger pressure drop across them which means the turbo has to work harder to supply its set boost level (if the boost is measured just before the TB that is). If it's measured after the compressor housing you'll probbaly pick up a pound or two fitting a better cooler.

Going from the stock shoebox intercooler to a decent FMIC will give you a performance increase because the ECU would be retarding the ignition advance, the moment it sees excessively high inlet air temps and possible detonation with the stock intercooler getting heatsoaked. The reason why you see more power with a new FMIC, is because the ECU is dialing in more ignition advance because of the cooler inlet temps. Although you do get a bit more lag as the turbo is filling the volume of the larger intercooler and piping until you notice it making boost pressure.

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