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The Evo X has the benefit of the intercooler already being in the front of the vehicle, but the core is still a pretty restrictive core. Perrin has used the space Mitsubishi provided and crammed the biggest most effective intercooler possible in there!
KEY POINTS TO INTERCOOLER DESIGN An intercooler is not ground breaking at all, but Perrin's core is different and made to a level different than the competition. When they built their core, Perrin made it as big as possible (not going to 4" thick which is a bit too thick) and still using the FULL opening in the bumper. 4" Intercoolers do work, but the downfall is the thicker it gets the less effective it gets. Given 2 cores with the same volume, a thinner core that is bigger in all ambient directions is better than a super thick one that is smaller on the ambient side. There is enough room to make this intercooler 4" thick but it does make it a very tight fit between the bumper and AC condenser. So some of Perrin's descision had to do with fit. So if you look at Perrin's core you can't really even see welds because they made it as wide as possible (while still fitting between the AC lines and being able to connect to the boost tubes). Wider is better as there is more ambient cooling surface. Because of the high IC inlet temps, a bigger core on the ambient side is important. The height of Perrin's core is also as big as they felt would still be functional. DIMENSIONS PERRIN 20.75" x 12.375" x 3.625" = 930 cu-in Ambient cu-in 256cu-in Brand-1 18" x 12" x 4" = 864 cu-in Ambient cu-in 216cu-in Brand-2 20" x 12.4" x 3.625" = 899 cu-in Ambient cu-in 248cu-in Perrin found the OEM isn't centered at all, so they fixed that (which is something not everyone has done). Perrin's core is not an off the shelf core, its one that they designed and had built. While that does add cost, it does make Perrin's that much better. Next up is the cast endtanks. These are also more expensive to make but flow better and look way nicer! This is not something people do initially on a new core because of cost. But this is the one more thing Perrin did to make their intercooler stand out from the rest.
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