05 Type S RH Reflash LSD
I don't know the answer of why/what breaks, but no, you are limited to the weakest determining factor which is the TSX bottom end and cannot rev it to the K20A2 limit without modifying/replacing some things. I remember many people putting in the K20 oil pump, for one. Also you will need to limit VTC to a lesser degree, IIRC. Yeah keep searching! My conclusion for myself would be to go all out with high compression pistons, etc., or just drop in a K24A2 long block straight up, if my motor ever did fail.