My prediction is 35r performance. 35r boost threshold and 35r power. The compressor maps look similar basically the same although the gtx30r wheel has to spin faster to produce the same results because it's smaller. So it may be that it actually lags slightly more on the 35r turbine than a 35r compressor would. Personally I'm going to run an HTA 3582 because they seem to have lower boost threshold than a normal 35r and make the same power.