Vwrx

Ok im not sure where exactly to put this so im goin to put it here. I was thinking of putting a EJ20TT WRX engine into a dune buggy. Ive read quite a bit about it saying that it fits great but the main thing is i need to redo the radiator position and exhaust. My question is what is the biggest problem that u run into when building it? Also im wondering how much hp and tq do u get and wat 1/4 time do u get with it? THX