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I wouldn't bother with just a 1.6.
It's as much hassle as swapping an F4R, but you don't get the power at the end of it...
It'd be easier switching interiors and putting the PH2 front end on your RSI TBH. Although you'd be left with a worthless PH2/PH1 1.2 mutant...
Save yourself the effort IMO. PH1's look better anyway!