This actually depends on what you mean by "very high streetable power." With a smaller engine (the STi obviously has less to worry about in this category) in order to get considerably more power is to raise the boost levels. There comes a point where in order to stay "Streetable" and use pump gas you are going to need the most efficient form of removing heat from your engine, other wise detonation can and most likely will occur.If either of those, go for a FMIC. Otherwise, very high streetable power is easily made with a really nice TMIC along with proper sealing.
You've just desribed the typical honda turbo'd car. And no... it ain't too fun to drive a car that you have to mash your foot everytime to get somewhereCloNeGTS said:A turbo car that doesn't want to run until higher up....no way I'm doing that to myself by choice.
4-5K rpm?!! At that rpms we are talking a race-prepped drag car with a MONSTER turbo. Look at the Evo, MazdaSpeed Protege, older Audi S4, MKIV Supra, etc. All of these cars have one or two FMIC-style intercoolers and none of them in their stock form are not street driveable. The FMIC is not really going to add that much lag into the system. A lot of the lag is controlled on the turbo's setup. With the 2.5L I don't think serious lag will really be an issue, even with a FMIC modification and with the boost just turned up.If more power would require a FMIC, that would be the end of power mods for me. The extra power is not worth a car that doesn't want to accelerate under 4-5k RPMS.