bahh everybody has a 4th gen tho... i help run atlantic canadian preludes and about 70% of our cars are 4th gens 5ths are too expensive for this guy if your going to do the swap yes the a3 is possible but don't do it you'd need the ecu and all that jazz get a a5 and do the swap shouldn't cost much more if it costs more at all... the h22 swaps are doable but ur looking a $$ for that prolly 2500 for the engine alone not to mention if ur car is rusty it'll tear it apart. So yes either find another 3rd with good engine or do the b20a5 swap