It just doesn't open up as high as I'd like it to for the larger and taller intercoolers. The air outlet behind the intercooler that comes with the GTZRII and the Bomex was really made for the increased airflow across large intercoolers. I don't want to hear about so-and-so still has the stock front and races. That's because of the class they're in and or the short runs with NOS that small increase of airflow isn't much. People will argue, just as they did with the 4.08 gears..... yet not one person to ride in my car with the 4.08's will get out and believe they aren't a nice difference.