3071 is a BIG turbo for a 1L. Better have a excellent designed header and proper exhaust housing to make it spool reasonably. 2871 is probably your best bet. You can get the t25 turbine housing on a 2860, 2871 or 3071 which is what you have on your rear mount. I would get the .86 a/r with any t25 turbine housing being they are fairly small turbine housings anyway. One reason you the Apex takes well to that smaller turbine housing is the 3 intake 2 exhaust valve head. You can put on a good size compressor like the 60 mm compressor wheel on the rs or the 71 mm 2871 compressor wheel and still have a small t25 turbine housing that makes great power. And the smaller the turbine housing and turbine wheel help a lot with spool up.