T3/T4 inlet diameters ?

Just wondering if anyone knows where I could find a T3/T4 turbocharger that has a 2.5'' inlet compressor and still flows around 500 hp / 400 whp

2.5" inlet is a bit too large for 500 hp. Take a look in for example Garrett GT30-GT35 instead. The GT series are better than the old T series.