Tbh although I fully agree that the Garrett core is the better option we have used a Chinese 300x700x100 on the front of a race car, approx 600hp @ 2 bar boost and Max IAT logged was mid 20's in a 15 minute race. A Airtec top fed unit would undoubtably suit most people's needs on a cossy but for those chasing big hp an extra £500 may be a worthwhile spend.
How the units are stacked and fed does appear to have a huge effect on cooling too, especially water temps so it's definitely worth panelling out the void to the cooler and behind it so the air can only pass through in one direction.