I have actually posted this on the other site
i am not sure if u read it or not
i have actually emailed Greddy and asked about them... here is what they said :
"The difference between the Type 31 and Type 24 intercooler kits is the size of the intercooler core. Type 31 measures H186 x L600 x W76mm and the Type 24 measures H276 x L600 x W76mm. So basically the kits are the same except the Type 24 is much taller.
Basically the Type 31 kit is the largest intercooler we could fit without having to cut into the bumper support. So the Type 24 is not recommended for use on the street since in order to install it you must cut or remove the front bumper support.
Power wise the Type 24 will give more flow and better cooling, but both kits work very well."
so.. the type 31 is the best.... unless u r boostinb VERY high
good luck....
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