There has to be more to the story?!?!? What fuel and what capacity and mods does the SR20 have? And whilst it boosts 24psi at 4,200rpm what power is it actually making at 4,200rpm. On a well sorted RB25 with thicker headgasket, Greddy inlet, Tomei cams and complete TD06SH-25G setup...
At 8,000 rpm it has 308 rwkw
At 7,000 rpm it has 320 rwkw
At 6,000 rpm it has 296 rwkw
At 5,000 rpm it has 230 rwkw
At 4,000 rpm it has 114 rwkw
That was on a dyno that read about 20-25rwkws lower then other dynos it went on and was a pretty conservative ignition map on 98 tune. No doubt it could be improved but massive divide between 360rwkws and 400rwkws out of a 25G compressor?!?!?!
I have a soft spot for the TD/Mitsu range of turbos. But in cases where people are putting turbos on built motors with external gates etc then what is an extra $1000 on a Garret or other turbo IF it gives you an extra 40rwkws at 4,000rpm and matches the top end? Bang for buck its up there...but personally I would bin my Trustck turbo if I could find a sharper tool in the shed