The .49 housing is not too small.
This is SR20, BC264 cams, and the G25-550 with .49 T25 housing on E85. Makes 285whp on 91 octane on a conservative tune.
The 2871r is a laggy bitch that is far surpassed by newer turbos. GTX2863, GTX2867, and even the GTX2860 Gen II are far superior turbos IMHO.